I believe the rears were spun welded into the 'C' channel.
I replaced mine in the 126 I restored about 10 years ago and they were a real PITA to remove requiring a Sawzall and air chisel for the rear one.
The front one, not so bad as it was only tack welded in a couple spots.
The rear is beveled to match a chamfer in the C channel and then friction welded to it.
Not for the faint of heart.
Your new pin or bolt will have to be flush with the end of the rear bushing due to the tight clearance between the "C" channel and the oil pan sump in the case of a 12HP or larger.
It will also need a grease relief turned into it as the original one did.
Good luck!
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