*Whistles through teeth*
Right. I guessed you were new. Do you have a large cheque book? You may need it.
Are you planning on doing this yourself? You will need at least a gearbox as well. In most states of this wide brown, slightly charcoaled land you will need brake upgrades as well.
Prices? Google.com is your friend, or call a motor importer. If you want a reco one, add more $$$.
This is not something to be undertaken by the faint hearted, and not a conversion (any of them) that will bolt into the car. A fair bit of fabrication will be involved. And I hope you're friendly with an engineer. I don't want to discourage you, but it's not an easy job. If you happen to be made of sterner stuff, the best of British luck and I'll be of as much help as I can, as I can provide photo's of my 2TG conversion.
Cheers
Rob