If you don't have any luck fitting that one, I have several single
cups (that i could contribute) from "last years" mishaps that I use to make or replace when missing a cup. The one at the top now is reinforced with two part epoxy
glue, both top and bottom, then faired to ensure it spins. So far, same spinner for two seasons!!! Three years in a row I lost
cup half way through the season and since I don't do heights, no speed for the rest of the season. I like you wa wondering so contacted SR and purchased 3 new ones while they still had stock. Also picked up a second whole system so have spare cards for both main unit and remote cockpit
unit. Also have lots of cables
and plugs for both units so if you get stuck let me know.