The original GM# 3693371 lever for the accelerator mechanism is different than the passenger car one pictured in that ebay ad. Below is an extract from a FAM with the lever circled to show what the truck lever looks like. Hope this may be of some help.
~ Dan 1951 Chevy 3 window 3100 Follow this story in the DITY Gallery "My Grandpa Carl's Truck and How it Became Mine" 1966 Chevelle (Wife's Hot Rod) | 2013 Chevy Silverado (Current daily driver) US Army MSG Retired (1977-1998) | Com Fac Maint Lead Tech Retired (1998-2021)