Moving forward in the game of “whatisit” on my Homelite, I got it freed up and took the cylinder off. It had seized due to moisture/corrosion and the bore on this cylinder is quite good. The piston may even be salvageable. Haven’t been able to get the clutch off yet but put some oil on the threads and letting it sit. Part number 63012....2” bore so it’s narrowed down to 700 or 901. How do I determine it from there?