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only have those on some 2000-2005ish, cont believe how cheap gm is in this respect, its such a great feature. i had a 03 and it had it but my o7 doesnt. cheap B'*
I seen a thread on here where a guy tried to make his own, NOT the smartest thing to do while the tank is still on the car, but I bet a really good modder could remove the tank and make one themselves, of course that greatly exceeds my abilities, lol
I guess they figure if they made it too easy others would DIY it, and not bring it in to have a dealer do the job.