Who makes an Aluminum master cylinder for 70 dart front manual disc brakes

Wilwood sells a nice one.

Can also buy one for 85 diplomat but that's s crap shoot because a lot of them aren't alum. When I was looking I found one alumn local to me and it was all beat to hell.
The cover on the "billet" Willwood m/c leaks around the screws. Those tiny screws are easy to drop/lose. I am replacing mine with a Baer m/c which has normal screw-on caps.