1" shaft, 1-3/4" stern tube size - believe it's a 30175. The 1-3/4 stern tube is that size due to a bushing inserted into 2" exhaust hose, so if you've a 2", you'd still be good.
Not QUITE enough clearance between the engine and the stern tube for me to use it. It Was installed, and used very briefly, but the lack of clearance worried me too much. It is in Perfect condition - maybe 10 hrs on it.
Cost me $260 - Throw me $150 and I'll be happy
Matt