Stop in for a cup of coffee

Rainy Day Auto said

so I think this one is a better deal, says 1.032 inch bore and says it's for manual front Disk and rear drums, doesn't specify what size of rear drum.

https://www.oreillyauto.com/detail/...9093/1973/dodge/dart?q=master+cylinder&pos=10

Click to expand...

I think the one you are looking for is the aluminum ram 80's one. I believe this is the one wilwood charges over $100 for also.
You may need the 2 to 4 bolt mopar mounting adapter, but this is what I used.

1989 DODGE W100 PICKUP 5.2L 318cid V8 Master Cylinder | RockAuto