Yes, it does. Why? Because the part is made with them. I didn't design it, GMC did (for whatever reason).
Part number GM-2202072 Insulator, engine support assy.
PN 081721 BOLT, hex head, s-fin, S, cd-plt (9/16-18NF3 x 1 1/8), insulator to frame and frame bracket)
ORD-9 SNL-G-508 July, 1945
That's why its needed
