Thanks for the help. Couldn't find it, didn't think to look in "antenna/speaker"
2002-2006 Acura RSX Bolt, Anchor 91853-S6M-A10 | OEM Parts Online2002-2006 Acura RSX Bolt, Anchor 91853-S6M-A10acura.oempartsonline.com
Yep, seems so. Or may have to get creative with the welding and the hardware. Find some sort of block to weld on, tap the appropriate threading, and then use the bolt linked above to tie down the spare.I'm guessing it must be part of this:
2005-2006 Acura RSX Panel Set, Rear Floor 04655-S6M-A50ZZ | OEMAcuraPart2005-2006 Acura RSX part # 04655-S6M-A50ZZ - Panel Set, Rear Floorwww.oemacuraparts.com
To get just the mount you may have to hit up a junk yard.