go on to
www.volvopentaparts.comyou need to know either the model # or the exact model of the drive. I can't decipher Volvo's arcane model numbering system. It would be far simpler to use production years I think. The part you are referring to is probably a plastic plate #s 53 and 55 in this diagram...(this is the joint venture OMC product that was the same as the Volvo SX in the same model years)....I have the same thing on my Cobra and what happens is that the retainer rings rust out and then the plastic plate falls off....You have to pull the drive to replace them....
http://www.crowleymarine.com/johnson-ev ... /57028.cfm