Hi,
S130 is correct you can start it with a transponder and a suitably shaped piece of wood. There are two different sized keys for the Croma, the earlier ones (06 and earlier?) are smaller. You can get replacement cases on ebay bu tey all seem to be th larger size. The transponder chip is the glass tube type and is glued to the remote control circuit board. Obviously the transponder must be programmed to the car.
Robert G8RPI.