Central locking for Clipper

A while back I had a Toad C542 (?) fitted to my cab, I really want to make it remote central locking with my existing fobs. Anyone done this to their car, was it easy and where shall I buy the unit from, Ive seen loads on ebay for twenty quid or so?

Thanks.

Hi. Had it done at Sextons, Nottingham after they fitted my Toad. Works a treat. Lazy tho cause I paid for them to do it for me.