'60-'66 Chev/GMC 2-Ton and Larger NOS Fender Extensions For Sale. Fit Chev C-40 to C-80 and GMC 4000 to 6500 Conventional Cab Trucks with Wide Axel. Note: Will not fit narrow axel fenders. These are the parts that fit in-between the rear side of the front fender at the bottom and the running board. New Condition with very minor shelf wear, $110 plus shipping. Reply to board or PM for more details.