I have a NIB Passport Laser shifter for sale. This will work perfect on a Silverado because of the two rectangular slots in our front bumpers. I purchased this planning on installing it in my truck but cannot since they're now illegal in Minnesota. This unit will work as a standalone or will integrate with your passport 8500 radar detector if you have one. Click on the URL below for more details. I paid $499.99 for it + tax locally, I will sell for $450.

http://www.passportsr1.com/zr3.htm