Victory at last. Thanks to filou, genixia, and the others for the valuable info. I ended up getting the Metra harnesses and made an in-between by wiring them together, [I think that's pretty much a M-F ISO connector then- you could probably get non-VW specific wires?] then I spliced in the ground for the blizsafe (ordered from rcainput- came maked as blitzsafe). Didn't have to touch the factory wires. The blizsafe goes in where the blue changer prewire to the trunk was. The blizafe and empeg are both spliced into factory ground- if it seems to noisy, I'll run a new ground. Initial tests are great. If it works, I'll attach a pic of the bastard, hack-job harness and the finished unit.