I raided my mum's loft over Xmas and found my 2 massive boxes of lego i had when i was a kid. Loads of sets and technic stuff in it. Cleaned it all up and am currently 90% of the way through building my old 8865 test car technics kit using instructions online. Me and the wife have got really into it and the kids love it, so glad i got it out.
Looks like i'm missing 2 wheels and the piston blocks for the engine, where is the best place to get old spares?
Try Bricklink, you can usually get most on there.