Factory sub alert: 12" slim sub in '99 Caddy SLS

Just a heads up for anyone who likes experimenting with "stock" GM parts...

I was in a junkyard today helping my buddy pull some rear struts for his Malibu, and they had just put a '99 Caddy SLS in the yard (bad motor, NOT cash for clunkers). Interior was in in beautiful shape, and it had a Bose audio system with a 12" subwoofer in the middle of the rear deck. It was a very slim sub; maybe 1.5" thick total, and I'm sure it's free-air, so anybody looking for a cheap subwoofer to experiment with that doesn't take up any room, you might consider this one. I know Bose is known for sneaky audio shortcuts and I won't get into them now, but I'm just sayin'. This might work well in a Caprice Sedan rear deck. I think the RM rear deck is too narrow for a 12" sub.

Any other factory subwoofers available?

I know my Lincoln Town Car has the factory JBL Sub in the rear deck...and they had that feature up through the years (if it has the JBL Soundsystem) Mine still sounds pretty good after 178k of use.

http://www.lincolnsonline.com/tech/00245.html