70 C10 Custom Mouldings

[amloya]

I recently purchased set of top and bottom mouldings for my 1970 C10 Custom longbed truck from LMC. The bottom moulding that goes behing rear tires is about 2 inches too long. All other pieces fit fine. The bottom moulding I received from LMC that goes behind the rear wheels measures 32 3/4" on top and 29" on bottom (it has an angled cut). I do not have a longhorn truck and I am trying to verify how many truck lengths are out there (short, longbed, longhorn)? Also has anyone else seen this before? As far as I know, bed has not been modified. Any idea what I need to specify or where I can get mouldings that I am missing? Thanks for your help!