Morris Minor Owners Club

I have been told I cannot put a late model of dizzy cap onto an mm distributor. These caps vary a lot in price. Why are the mm ones so pricey and why are they not interchangeable?

Completely different shape. No easy to find and possibly no longer made.

Just use a later distributor?

The Series MM engine uses a DYHK4A distributor which has a different cap. These should be available for top entry or side entry HT leads from MMOC Club Spares. The later 25D distributor will fit without vacuum advance