I bought the PIOGM1 through
http://www.soundgate.com/products/cd/hummer.htm
I got the Pioneer IP bus to RCA adapter at a local car stereo store
The Belkin piece can be bought at Best Buy.
'03 Black H2, fairly dressed up
'00 Black Mercedes S430
'03 Mineral Grey Powerstroke Diesel 4x4 Ford Excursion
'02 Black Honda Goldwing