determine piston size?

[rlbauer]

Hi, hope someone can help me. I'm replacing a 3 ton york air handler with a 3 ton goodman (m#aruf 363616). The heat pump is a 3 ton Tempstar(m#ch9536). There is a piston kit chart included but I don't see Tempstar model number anywhere. Can someone tell me if i can use the piston provided with the airhandler, or may i need a different size? any feedback would be greatly appreciated!

[beenthere]

Thats because they are not matching units.

There is not piston match to that combination.

[Morrison]

what worked be for,is a good starting point