1972 MC5B rear engine mount

[Jsrcaptain]

i have the pre-trunnion engine mount. Got it from Luke. The PO has put a couple of pieces of thick rubber in place of the mount and a long bolt through the whole thing. I'm not finding any guidance from my meager manuals. It looks like one short bolt holds the mount to the frame from the bottom and another holds the top to the engine. Waddaya think? Anyone know th bolt sizes?
As a hilarious side note, he installed the four large side bolts with the correct size castellated nuts, but the bolts weren't drilled for cotter keys and one bolt on each side dropped out and is missing. Somehow, the large convex washers were still sitting on the top of the mount.