Sometimes there are common castings with the fittings changed. I got the lathe extension for my Rockler/Excelsior lathe from PSI (for the TurnCrafter) and it fit right up perfectly; just needed some black paint. But the motor specs are slightly different and the speed readouts are in different places, so I would be very hesitant about getting headstock parts from them. HF now has a lathe on the same casting also, with yet another set of slightly different specs. Anyway, my point is that looking close at the exterior and measuring down to thousandths is about the casting and doesn't guarantee much else. Joe's advice is dead on about part numbers; they don't always do that, but it seems very common. I have Googled for lots of things using a number and leaving the letters off and finding it as a diferent brand.