I recommend one of the Buyers Products Fabricators Hitch Plate Kits for your 2006 GMC Topkick 7500 as there is not a hitch plate specific to your vehicle. Here are the ones we carry.
Buyers Products Fabricators Hitch Plate - 3/4" x 34-1/2" x 22-1/2" # 3371809027A
Buyers Products Fabricators Hitch Plate - 5/8" x 34-1/2" x 22-1/2" # 3371809043
Buyers Products Fabricators Hitch Plate - 1/2" x 34-5/8" x 15-5/8" # 3371809040
Buyers Products Fabricators Hitch Plate - 5/8" x 34-1/2" x 15-1/2"... view full answer...