If its a Digi, a 2e botrtom end will go straight on, and work. The 2e dizzy is compatible with digifant injection. If its an ADY lump, you need a 2e Dizzy as the ADY dizzy uses a different pulse system, and you cant twist it to set the timing either.
As yours is K-Jet, you'll have to fit your old K-Jet dizzy. To do this you'll need an adaptor, and you have to swap the gear off the MK3 Dizzy onto it.