MANCINI no longer has the one for disc/drum. anyone?

I bought mine from "The Ram Man" at the Mopar Nats years ago. He had a big stack of NOS. I normally wouldn't deal with him but it was in person and was just a small part. He got all loud and questioned what my application was. I almost walked away.

tried to buy from him. after waiting a month to ship i have my credit card do a charge back. he doesnt return phone calls or answer email.

my one and only interaction with him was at carlise, maybe 20 or so years ago. as soon as he opened his mouth, well, that was it.
i didn't even wait until he answered my question, i could just tell what sort of guy he was, so i walked away. i don't want, or like, to be around people like him.

User Moparjohn just listed one that should be correct for that MC in the E bodies parts for sale section here.
They used to be available as replacement parts at any parts store like NAPA, but probably not anymore.

are all disc/drum master lids the same in 1973, or are they model/bore size specific ?

As far as the finish is concerned, I've heard most people say they are yellow zinc plated. Maybe some of them are but I'm not sure they all were. This is a picture of a 73 Cuda taken when the car was only a couple months old. It was built within a couple weeks of my Challenger in October 72. This lid is not yellow zinc.

The car never ran right from the factory and this picture was taken right after a replacement carb was installed. Everything else is original. I think the car has less than 40K miles on it even today.(original owner car)

That picture supports what I stated in my article in Mopar Action in 2005 about Mopar original master cylinders, that 1971-1974 master cylinders had a gray phosphate or Parkerized type finish on them. Only replacement caps including OEM ones would have had the semi gloss plating.

All the disc/drum MC caps were the same. The drum brake caps were different but the same style for them for all models equipped with 4 wheel drum brakes 71 through 74.
I find it interesting that Mopar had so much variation in disc drum master cylinders from ‘67-‘70 depending on year and body platform, yet an almost universal 4 wheel drum brake MC during those years.
Starting in 71 through 74 they used a standard disc brake MC across all platforms and a standard drum brake MC across all platforms with only a few exceptions (71 hemi disc, e body manual disc being a few of the exceptions).