sstock,
I happen to have the luxury of having a couple of the master parts catalogs. Both of them have the inner fenders listed on two pages. It starts on one page and carries over to the next. I suspect that is what is going on with the one that you posted. Unfortunately, you have no way of knowing that, if you are looking at a web site, with page that has been copied and pasted to. There are two different part numbers listed for both Commercial and Utility sized trucks. Here's how they are listed.
47-53 All Comm left, front 3683075
47-53 All Comm right, front 3683076
47-53 All Utility left, front 3683081
47-53 All Utility right, front 3683082
54-55 Have different part number
Just for good measure, I asked a friend that has both a half ton and big trucks. He measured both of them for us. The half ton inner fender measures 44 inches. While the big trucks measured, almost 49. Hopefully that answers the question for Chooglin. Hope this helps.
Rugo
