If it had 6.25s, it was modified to fit 6.25s, and thats what you shouls buy.
Personally, I say disconnect them. When you go to a concerrt, does the sound come from behind? At any musical event, when does it come from any but the stage, infront of you? In a car, there is no need for surround sound IMO. I have mine disconnected, the imaging is much better due to no rear noise.
<span style='color:gray'><span style='font-family:Courier'>1995 e36 3 Series RIP
1999 e46 3 Series BURN IN HELL
2000 MR-S Roadster= Current</span></span>