Sorry in advance for reviving this old thread. This past Monday, I place the order for the Old Air Products hidden vent package. I decided to go with the entire inside and outside kit/package and NOT try and re-use my Bosch compressor I have on hand. The kit should arrive in a day or two and I plan to write up a blurb about how well the kit integrates into an otherwise stock interior. Hopefully some informative photos along the way. Incidentally I also added an electric condenser fan (definitely needed in Texas)as well as trinary safety switch (compressor off on low, high pressures and electric fan on with compressor). To my door is a hefty $1500 or so.
Stay tuned....
Hopefully it works out well for you. I definitely think that getting the entire kit with compressor is better in that case, and will make for an easier installation.