4A tranny top hat bushing

[Jim Wallace <jim.wallace@netscape.ca>]

I have been advised to replace the top hat bushing as a matter of course 
while rebuilding the transmission. It runs in my mind that there were a 
batch that were not so good in recent times; can someone tell me which ones 
are known to be good? I would rather not rebuild this transmission again in 
the near future. Or ever, really.
I prefer to buy from TRF but if theirs are the not-so-good ones I'd like to 
know.
Thanks,
Jim