erm, the mk5 rear handle is just a handle, there are no keys. it works off the central locking, had to get an auto sparky to wire it up. depending on your guy allow 100 bucks for it
managed to win the tailgate on ebay for 13 quid, body work wise it was take old handle out, weld a plate in and then cut the whole handle out the mk5 tailgate and graft it on to the nk4 tailgate. alot of work. i was quoted 350 but got svag club discount so 300.