Thanks for the pics Denny - got three more questions for you.
I'm starting to see why I am confused about the mount. Your pics show that I am missing a piece ... part #3656502 "SHIELD." I hope that is the piece that I have on order.
Here is a close-up pic of the top of my motor mount. No shield. It looks just like the
the diagram in the '54 Shop Manual. I guess the Shop Manual diagram does not show the entire mount. I believe that the bump on my plate is the head of a carriage bolt, not a dimple in the plate. The two center bolts are just sitting on the front plate. They are not secured to the cross member. I can poke them up with my finger.
Q1 >>> Are the bolt holes in the engine front plate square to accept a carriage bolt? (The two center bolts.) Looks like a carriage bolt in your pics.
Q2 >>> What size & thread pitch are the two center bolts. The Assembly Manual defines them as "Furnished by Engine Plant." They are not listed in the MPC.
Q3 >>> Do the washers and nuts of the center bolts press against the rubber cushion?
So it looks like I need
+ a new Shield (#3656503) on order
+ two bolts and nuts for the center holes. What type?
+ two 7/16"ID X 13/16"OD washers for the center bolts
+ two 3/8-24 X 1-7/8" carriage bolts and nuts for the outer holes.
+ two 3/8"ID X 1-1/4"OD washers for the outer bolts
Clarification: I mentioned in my opening post that the rubber cusion appeared to be cracked. I was wrong. I was seeing the paint on the metal retainer (#368440) instead of the cushion.