So if I'm reading this correctly -
"
You are viewing a new, CNC machined from 6061 billet aluminum bolt on chain drive conversion that will fit XS1100's and XS750/850's. It will require you to mount a different swing arm. It will also only allow the mounting of a 13 tooth sprocket unless the crankcases are modified for clearance. This item does not come with a warranty, it is a custom machined mechanical solution to be applied at your own risk. I carefully pack your item so it arrives safely which takes time. Please pay attention to the handling time that is specified. Also, I will require a core middle drive unit or at least the shaft to replace the one that I modified for this unit. Shipping is free to the lower 48 states, anywhere else and the buyer is responsible for the difference in cost. Thank you for looking at my item and Good Luck bidding.
"
You're bidding on a newly machined (accurately?) casing with a rusty looking shaft that has no warranty, and is he asking for another middle drive in exchange as well?
Actually, I just found the seller put up the drive for sale on the Dotcom site -
CLICKAnd.............looking a bit further back, here's a thread about him building one-
CLICKY