Rob Ron Leonard or Jim Feldman might be able to help you in USA, In the UK there are a few people/ Company's that might have a Spare tailpiece.
Might be worth e mailing Ben Yates on :-
kinnertoncourt@talktalk.net
As he makes up and regularly supplies and often fits Overdrive units to Aces & Acecas, Therefor he should know who in UK & Europe has recently carried out conversion, Hence could have a tailpiece surplus to requirement.
Just a thought .. [
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Good Luck
Keith ..[
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