MGB Gearbox thrust washers...Where to buy ??

[joneda@aud.alcatel.com (David A. Jones)]

Hi everyone,
  I stripped my 74 MGB gearbox and need to buy Layshaft Thrust washers, and
  Mainshaaft thrust washers..I was wondering if anyone knows where to buy them??
  I called the big three...Moss, Roadster Factory, British Victoria..and they
  did not have them.  The spec if I remeber correctly is something like
  .003" - .005" .  Mine are just a little worn...not really that bad, but I 
  wanted to put the box back to the Factory Spec.  Others I have talked to 
  who rebuild boxes say they usually don't replace these...
  
Any help or advice would greatly be appreciated,

Thanks,
David Jones