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I have crimeguard and brands like that. I left them there cause it would be too much to keep track of right now. I am trying to clear out other car audio items on another post.
There were some available from GM dealers, when I was looking last winter. I didn't want to pay what they wanted, so I bought a Bulldog Keyless entry for $20 off Ebay.
I did a search six months ago for a non-alarm keyless and a window controller, and decided on the DEI 712t (sold under various brand names with same model #.)
I think it was about $30 from Amazon.
Haven't installed it yet, so can't speak to performance, but the brand had better reviews than most of the other cheap ones.
FYI, I think the VKE-1000 must have been made by DEI.
I started installing mine tonight, and happened to look at the VKE-1000 manual. Based on the common drawings, wire colors, and wire labels they appear to be made by the same company.