[Shotimes] Audio question: Factory subwoofer

[van Oss]

I've just received a factory subwoofer and amp.  I'd like to install them in
one of my SHOs.

The 92 came wired for Premium Sound.  It still is stock (as regards audio).
I do not see any connection point for the subwoofer in this car.

The 91 came JBL from the factory (at least, that's what the front door say).
It came to me with no radio and a lot of amputated wiring, on which I
managed to install a cheapo aftermarket head unit, which is working.
Ideally, I'd like to make the sub-woofer work in this car.    It's at
Courtney's right now, so I'm unable to inspect its connections.  For what
sort of connectors shall I look in hope of finding a ready-made installation
for this sub-woofer?

Any other tips?  Mind you, I'm on a limited budget and am not an aficionado
about audio gear.

Joseph van Oss