1932 Ford Model B transmission leak fix ideas

[37 Coupe]

I have pulled the engine and transmission to address the oil pan and the much worse rear of transmission leak. Only 300 miles on the engine and transmission rebuild when I bought this 5 window last October. Looks like previous owner used an entire tube of silicone sealant to slow leak that is probably coming from the two shafts idler that penetrate the rear of case but also the main shaft. Used to be cures like O Ring shafts but do not see them available anymore. Another was to use red loctite on shafts and hope it doesn't ooze into a gear bore before it sets up or trouble next rebuild or repair. Also another interesting thing I found was two missing 7/16" bolts upper part of flywheel housing to engine block. Might have been a good thing as I can see a gap where on a Model A there would be brass shim or two.Not as critical as Model A? but glad someone didn't torque bolts down and break or distort the two upper ears on housing.