Well I say I have I bought the units from flea bay and had them put in when I had an alarm fitted, you want to go for the smallest units you can get
 
maplin do a retro kit for £20. its not on a fob but when you turn the key in the drivers door it opens all the others. great if you have a double cab.

cant be that hard to fit if maplin sell them to monkeys.

G
 

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