60-series gearbox is a much better choice for an A15. The ratios are exactly the same, but it is strong enough for an A15.

But a 56A will work. Same driveshaft, same flywheel, shifter, clutch, etc.

The only thing that is different is the gearbox crossmember (mount). The B110 original setup has the correct crossmember and mount for a 56A 4-speed.

You can use A15 flywheel or A12 flywheel -- but the flywheels use different release bearing Sleeves.

* With A12 flywheel, use short bearing sleeve OR engine plate (but not both)

* For smoother low-speed driving, use the A14/A15 flywheel. This requires both short bearing sleeve + engine plate

Engine Plate:



A12 flyweel: 28 mm thick
A14/A15: 30 mm thick