What an interchange number is, and why it matters more than the year
If you only learn one thing before buying a used truck part, learn this one. An interchange number is the reason a part off a 2017 truck can bolt straight onto your 2019, and the reason a part off a truck that looks identical to yours sometimes will not.
The short version
Manufacturers do not redesign every part every year. A front bumper might carry over unchanged for five model years, then change halfway through a sixth. An interchange number is the industry's way of recording which vehicles share a given part, regardless of what the badge on the tailgate says.
So when we say a bumper fits 2017 to 2019, that is not us guessing from the photographs. It is the interchange telling us those three model years took the same part.
Why the year on its own lies to you
Model years and calendar years are different things, and manufacturers change parts mid-cycle. A truck built in August of one year can carry the next year's part. Two trucks with the same year on the title can have different bumpers if one was built before a running change and one after.
This is why "it is a 2018, so I need a 2018 bumper" gets people the wrong part. What you actually need is the part that your specific truck takes, and the interchange is how that gets established.
What actually changes a part number
More things than people expect:
Fog lights. A bumper with fog light cutouts and one without are different parts. They are not interchangeable and you cannot cut the holes yourself and expect it to look right.
Sensors. Parking sensors and blind spot sensors need holes in specific places. A bumper from a truck without them has no holes.
Tow package. Changes rear bumper structure and sometimes the step pad.
Trim level. Chrome, painted and black plastic versions of the same bumper are usually different part numbers.
Cab and bed length. Critical for beds and bed sides. Irrelevant for a tailgate.
How to give us what we need
The fastest route is the VIN. It encodes the plant, the year and the build, and it lets us check the interchange properly rather than working from what you can see.
If you would rather not send a VIN, give us three things: the year, the cab, and the bed length. For a bumper we will also want to know whether you have fog lights and whether you have parking sensors. Look at the bumper currently on the truck and tell us what holes are in it.
What we do at our end
Every part we pull gets its fitment recorded against the truck it came off. That is why we buy whole vehicles: a part with a known donor has a known interchange, and a part in a pile does not.
When you search this site, the year range on every listing comes from that record. If your year is inside it, the part fits. If your year is not listed but you think it should be, ask, because interchange data is occasionally broader than what we have published.
The mistake that costs the most
Ordering a bumper by eye from a photograph because it looks the same as yours. Bumpers photograph almost identically across trim levels and the differences are in the holes. Check the holes. Ask us if you are not sure. It takes one email and it saves a freight bill in both directions.
Where the number actually lives
On most factory panels there is a stamped or moulded part number somewhere on the back face. On bumpers it is often on the inner reinforcement. On tailgates it can be on the inner skin behind the trim panel. It is not always legible after eight years of road salt, which is part of why interchange databases exist at all.
If you can read the number off the part currently on your truck, that is the single most useful thing you can send us. It removes every assumption from the process.
Interchange is not the same as "will bolt on"
Worth separating two ideas. Interchange says the factory used the same part across a set of vehicles. That is a stronger claim than a part physically bolting up.
Plenty of parts will bolt to a truck they were never designed for, and then sit a quarter inch proud, or foul the tailgate when it opens, or leave a gap you can see from across the yard. The bolt holes lining up is the beginning of fitment, not the end of it.
When we publish a year range, we mean the factory interchange, not "somebody got one on once".
Heavy duty and light duty are different trucks
An F-150 and an F-250 look related and are not. Half-ton and three-quarter-ton trucks are built on different frames with different panel dimensions. The same applies to a Silverado 1500 against a 2500, and a Ram 1500 against a 2500.
People get caught by this constantly, because the badging is similar and the trucks look similar in a photograph. If you are not certain which you have, the door jamb sticker will tell you.
Super Duty, and why it is its own thing
Ford's Super Duty line runs on its own generation cycle, separate from the F-150. A Super Duty part will not fit an F-150 and vice versa, regardless of the year matching. When you tell us the model, tell us whether it is a Super Duty.
A worked example
Somebody needs a front bumper for a 2018 F-250. Straightforward on the face of it. Then the questions start.
Is it a Super Duty? Yes. Does it have fog lights? Yes. Does it have parking sensors? No. Is it chrome or painted? Chrome.
That set of answers narrows a hundred possible bumpers down to the ones that will actually work, and the year range on the correct part turns out to be 2017 to 2019 because that is the generation. A 2016 bumper is a different generation entirely and will not go near it.
Four questions, one right part. That is the whole method.
