I ran a Sunny wagon [A14] clutch in my 1000. It used the 1200GX engine, 1000 flywheel [lightened & drilled for 1200 clutch] & 120Y 5 speed box. I never ever had a moments problem.

Just get the clutch mob supply you, as a kit, an A14 or A15 pressure plate, the clutch disc that fits your gearbox shaft, & a release bearing that services your application, & i think these are the same for all A series from A12 on.