Which ringed .61 crank do I choose?

[proptop7]

Hi...
I see 2 part #'s for the ringed .61's crankshaft.
17-6101 and 17-6103

I have a series 75 w/ the early , flatted prop driver. I'd like to stick with that style if possable.

However, I hear that that crank is no longer available? If so, which part # do I use to order, and what other parts do I need? I would assume the collet and drive washer, correct?

Thanks,
Tom

[MECOA]

17-6103 has the 2 flats for the prop driver

[proptop7]

Thank you! 8) :)