weewilly,

Is the attached pic below (taken from my 1947-54 FAM) the diagram you are referring to???

If your rear mount is like this, that long bolt needs to have the sleeve (spacer) and the "bolt lock" plate to install/secure the mount and bellhousing correctly to the crossmember.

If my info is inaccurate, am sure fellow Bolters with more knowledge will come along and offer more info.

Dan
Attachments
Rear Engine Mount from 1947-54 FAM.JPG (81.18 KB, 104 downloads)
Rear engine mount diagram

~ Dan
1951 Chevy 3 window 3100
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"My Grandpa Carl's Truck and How it Became Mine"
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US Army MSG Retired (1977-1998) | Com Fac Maint Lead Tech Retired (1998-2021)