re; Hammered center bolt washers.

Heres a photo of the 1's i took out, i believe they're original to day built. The od measures rch more than 13/16". Remember these nuts & bolts are tight to 7/16 nft torque specs. They are not compressing the mount rubber like the outboard bolts are. Outboard bolts are snug tight only.

washers, https://postimg.cc/gallery/2a2hxsvnq/