yes rob, they do, i had to swap mine when i did my gti install.

BTW< now that you have added a deck, use that stereo wire from the security system to add a shock, tilt and radar motion sensor to your factory alarm.

at vwvortex.com it is referred to as the rockstar ghetto alarm mod. As good or better then aftermarkets and doable for about 60$. Just some advice, the VW factory system is great..if no one breaks a window and climbs in through it. Let me know if you need more detail.