Think its an 8900E but not sure. Came with my present xx I bought from RedFury a few years back (JCRich's old xx). Ride was too stiff for the ex pillion so put a stock shock back on the bike. The Penske been sitting with other spare parts for the last couple of years. JC said he paid around $500 for it new a few years back. Think they're going for a bit over $600 now. I'm thinking $250 is a fair price.