Yes, the original part number for the "reinforcement" was Group 1.062, P/N 3720616, and was used (among other models and divisions), on the 68 Camaro with Torque Drive and 67-68 Camaro V8 (exc C60 or A.I.R.). The original dimensions were 1/4" thick x 3.5" OD x 5/8" ID with four 11/32" holes.
Ed