Miguel. It looks like your new cables are very similar to the AC-Delco ones I got off RockAuto. They didn't fit in the frame bracket, but appeared to be OK at the backing plate. But I didn't use them.
What I found was parking brake cables from LMC Truck. They fit perfectly and although they didn't look exactly like the originals, they're what I used, and they're reasonably priced as well.
Buy them
HERE PN 34-3806.
