Hi Boxhead,
Some things might be best purchased from your kit supplier. That way its their fault if they dont fit.
That said I ordered my bumpers and overriders from DRB. The parts have Snake Bite stamped on them.
Auto Spares Galore has many parts for classic cars. I got my lucas lights there. Also picked up a 2nd hand wiper system from a triumph (3 blade) for a reasonable cost.
Auto Spares Galore
They are at 924 Burwood Hwy, Ferntree Gully PH: 9758 3644
Doug Pearce is also helpfull with parts and ideas.
Doug Pearce Engineering
Factory 13, 91-99 Beresford Road, Lilydale PH: 9739 4222
I also got quite a few parts from Europa Spares in England. Its not cheap but its great stuff (service is prompt).
www.europaspares.com
Good Luck
Cameron