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You can find the regulators in any 79-87 G-Body. Now you have to know what your looking at because there are some regulators that dont have the tangs to accept the springs. I'm not 100% for sure but IIRC the center pivot shaft had a slot cut in to accept the spring which might be an easyway to ID them. Heck you might already them in your car and not even know it. The springs you'll have to score from the boneyard. You can find them in any 79-85 E-Body(Riviera,ElDorado or Toronado). I've also seen them in late 90's to early 00's vintage Cadillac Deville/Sevilles.

IMO the springs aren't really worth the hassle. Just remember they are a spring. What helps the window go down faster just might make them roll back up slower.

Just came across this by accident:
http://rides.webshots.com/photo/1148860209036331439arzmKc

The Kirban kit was just a hot wire kit. You could probably make one with a little effort or if you talked real nice to him John at Caspers could fix you one up.