The dealer installed the VCIM from the '08 XLR. It was a simple Plug and Play swap, nothing else is required. They charged me 0.2 hours, which is what the original Document ID#1749457 dated Jan. 9, 2006 said it should be. When I bought the used VCIM from the '08 XLR I got the VIN and complete description of the parts car from which it came, and the STID/TRACE/ESN numbers are on the back of the VCIM unit. It powers up and is operational, but the dealer conversion program from analog to digital is long obsolete and they had problems getting it to communicate with OnStar. We've already had our first snow storm of the year and I have put my '04 XLR up for the winter, so will work on it in the Spring with OnStar Connected Services when I get the car out of hibernation. Hope this helps, thanks for asking. My Best, Mike