I believe it's called a "spindle" as per the 1960 " A" Group Spares Book. Pg. 22, Crankcase. It's the drive off the end of the oil pump.
There are two numbers listed one for the A7, A7SS and A10 (67-1389) and another for the A10 SR (42-0156). There's a washer particular to the SR (42-0157) and a circlip (42-0159).
Tough to find in the book, really have to know where to look. Took me a few minutes to find it and I could be wrong.
Don in Nipomo :bigt: