Its always best to CALL the MANUFACTURER and find out what a TOTAL REBUILD will cost,( IF the parts are rebuild-able) and the EXACT application the supercharger, in question is designed for, and its current price to replace, find out if its CURRENTLY in production or discontinued, before bidding on components and even then a careful inspection is mandatory, I see lots of JUNK in need of a total rebuild sold on EBAY for example as good used parts.
when you buy used superchargers its almost a given its ASSUMED that they are in NEED of a rebuild before use, and purchasing a size/trim that won,t match your application , displacement, compression and fit into your vehicle with the required brackets being available is rather a waste of time & money