1. He doesn't state whatthe hotsdie a/r is, could be another .42 or .48.
2. The turbine wheel is pretty oily, deffinetly needs a turbine seal, may as well rebuild it.
If you don't know how to rebuild one (easy), I wouldn't get one off Ebay. Worst case is a compressor blade is bent, motor spit out a piston chunk and f 'd up the turbine wheel or ran dirty oil and scored the bearing surface on the turbine shaft (can be machined but more $$). I've bought 4 on ebay and they all needed a rebuild. I bid knowing what it cost me to r&r one.