Rear stub axles for Ace or Aceca

[AcecaRacer]

Hi gang,
   
   Anyone know where I can source rear stub axles in the US for my Aceca?
   
   Just blew one up and need a replacement! [:(!]
   
   Preferably ones that have been improved from stock.  Is there a part cross reference?
   
   Also, has anyone upgraded their rears to cobra spec?  I have to believe those are much stronger.
   
   Thanks!
   Rob

[aceaceca]

Do you need the whole thing or maybe just ends and joints and such?