I Concur with Doc on Suzuiparts in SA. I also learnt an expensive lesson on where to buy parts re my first RM restoration around 7 years ago.Mr Suziparts actually tends to source a lot of parts via a mainstream dealer mentioned in this topic earlier and margins up the part to Joe Punter.
I have found that Mick Hone, Alpha-Sports and good old Evilbay are the best places to source parts.