fontyyy wrote:I've got (what should be) and mc21 flywheel here 03700-2461.

Okay, so if yours is a 21 ( which you are not sure about ), then the 1st flywheel might be a 21 ? Can you maybe compare the 21 flywheel you have to the flywheel on your 28? ( If you still have the 28 flywheel on? )