Are these two seperate interfaces or does one work for both devices? If it is two seperate items, how do they share the 35 pin plug socket?

 

I have both. One interface harness plugged into 35 pin socket. the harness has a plug for Garmin 660/665 mount and a plug for the IPOD module. When ordering both end up with two wire harnesses. Can order components separate but works out cheaper to just order both kits.