Mopar Muscle Association UK

IMO 1350 are not "standard" joints and need a modified Prop/specific Yoke. Chrysler joints come in 7260 or 7290 patterns. I had 1350 on my 440+6 cuda but it was an after-market slip yoke and a modified prop with larger "eyes" on it.

Sorry if I have got the wrong end of the stick here.....

I agree....they MAY have used 1350 on Danas (can't remember off top of head but a web search will quickly confirm), but most Mopars were 7260 (small) or 7290 (large). Easily available from many places, both over here and US