Hey good luck, i was trying to get a 10.4" sheaves for my old sled but could never find anybody selling them. Your best bet is to order off of BDX website, that is what i did. They just sell the 10.4 sheaves for $199 i believe i paided. Hope this helps man
If you have access to a lathe you can make yours into a 10.4 very easily. A machine shop would probably do it for $20-$50. Then you don't have all of the clearance issues that come with the 10.4.