Subwoofer for rear door
This is a 10" Alpine sub (SWS-1043D) in a sealed Bassworx Reference Series enclosure (RS10RG). The previous owner of my 90 ST had this mounted to the rear door and it was a perfect fit. It sounds great too.
It was originally mounted to the rear door so the enclosure used the inside portion of the tire carrier bolts.
Shipping is tough on this as it's heavy- $110 plus $25 to ship it. Or come to Long Island and pick it up.
It's been in my garage for a year so it just needs to be cleaned off a bit.