Mick, Sorry for your troubles....what a PITA!!
I'm not sure what your game plan is at this point for a new rear main seal, but I'm fairly certain I have a couple of very old (asbestos) rope seals out of some very old, like 1979, fel-pro gasket kits. I'm CERTAIN I have a 3" version, and will check on a 3-1/4"....
Would be glad to help you out and send you one for the cost of shipping if you are interested.....
BTW, If I don't get time tomorrow am, then it'll be on Monday as I'm leaving for the Uprising Friday afternoon (driving the Lamnas) and won't be back til late Sunday.
Lemme know either way...
Jim
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"XE cam basher" 
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