Far be it from me to teach you to suck eggs
@merlin, but I'd be a bit worried about using a used one in your car, after what happened with my engine
What do you need off it? I think I still have the old one kicking about and it it's just plastic covers etc?...
Back when mine killed my engine, I think it was Probe Distributors that was recommended to me, I managed to find them selling on ebay a tad cheaper than their own site :-/ Can't seem to find you some links though

Was about £135 from memory.