I have 5 speakers consisting of 2 in the door, 2 in the rear seating area and a sub in the hatch. All are factory Bose equipment and I just bought a new HU. I took the panels off to check everything and was going to do the trick from Brent on how to hook them up but I find out that 3 of the 5 aren't even hooked up?? Previous owner must have had a system in here because the speaker wires are just cut. Also, there is a single RCA cable in the hatch area. Is this factory? I guess I have to replace all the speakers and crap so I need to know their sizes. Thanks,

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94 Z28 A4 GU5
Currently in the shop
TransGo Shift Kit