I've had camper caps on almost every truck I've owned, in the early 70's to mid 90's they were somewhat interchangeable, being the widths were the same, The length of course is what had to be correct, when I bought my '99 f-250 I mistakenly bought a used camper cap from an earlier model f-150 which had the same length bed, Paying no attention to the width I realized when transferring it over the camper was stepped in by 2" each side at the front rail of the bed, and at the rear it hung past by more than 1" each side, What I learned was the new f-250 design had a tapered bed ( wider at the cab and narrow at the rear ) Not only this but the cab height is higher over the camper cap by 2 1/2 inches. To bad for me because this was a very nice elite camper cap for a good price,
I latter found one that fit perfectly but was Black and did not match my white truck

although I went ahead and bought it with intention of painting it later, however it never happen before I sold it, a few years later I found another perfect fit and was white, although had a broken side glass, scored it for 50.00
Same- ol-thing ... any time I needed to haul something the camper is on,so I wound up removing it, it lays around for 6 months gets dirty and weathered so I sell it,
I think the answer to you question is ( YES ) on most if not all of the later year model trucks a camper has to be spacific to the truck, and this is why I think has run the cost of them up so high, anywhere from 1000-to-2500 bucks for a camper cap.... Not for me..

I look for used ones,:thumbsup: