Don,
Novak transmissions, at the link I gave above, probably has/sells the part you want.
You might find it listed by part number on eBay.
You might want to post a part-wanted ad here.
“Can I adapt a bullet to this tranny.”
What is a bullet?
If it is the enclosed drive-shaft enclosure/fittings, yes (for/on any SM 420 transmission).
You would also need both of the enclosed drive-shaft 4-speed u-joint yokes.
