Replaced that bit when I refurbed my TUB with a floor kit from YRM its a bit of a pig, I'd actually got my tub off the chassis and upside down. Its spot weld to the floor and glued and theres an angled bracket glued and spot welded in each corner, and if I remember correct its riveted to two brackets one each side the door opening. Mine is a 110 csw but I would imagine they're fitted the same no matter what model.