Reg300D,
I'm planning and getting ready to answer your very question... probably tomorrow!

My situation is with a 1980 300D[na] M-b with a 722.118 transmission and 300K miles. The K1 kit is made for the 722.3 & 722.4 trannies and you will not find a comparible kit for our series trannies [ 722.0/722.1/722.2 ].

If you can be patient, I'll answer your question.

I'll probably end up having to rebuild this tranny, so can you give me the particulars of who you ended up using for your rebuild?
From one who is only slightly less of a "NewBie" !
Sam // Novato, CA