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So I went down to napa to get the dual master cylinder for my M37. We had to look thru the books to find it. We came up with part# 36359. They look about the same except the new master cylinder has
The new MC has 2 bolt holes for mounting vs 3 on the old
The new MC mounts holes are wider apart
The new MC has the ports on the frame side vs rear (which I knew was going to happen.

Any one know if I got the right MC to convert to a dual circuit MC?

Go to www.uglytruckling.com and click on M37. There is a most informative article there on the dual MC.

The M/C you need is 10-1584.

For my Hanging Pedals I went with a Master Cylinder with a 1-5/16" Bore unit (BENDIX 11584 / NAPA 39017).