Technical Wheel cylinders…

Trying to find some replacement wheel cylinders for my 1940 Oldsmobile series 60. One pair is stamped: EIS 520 EW 6092, and the other pair: EIS 521.
I tried looking them up online by the number, and by the car and model. I had a few hits on EBay but no interchange lists. Lots of the wheel cylinders look similar and I’m installing an F100 dual master cylinder. I guess I could make a pattern out the mount bolt pattern and bring it to the local NAPA…
Any suggestions would be appreciated.

 

https://www.fusickautomotiveproducts.com/departments.asp?dept=130

 

Can you clean them up, replace the rubber parts, and use them?

 

I met a guy at Pleasanton during a GG swap meet. His name was Joe Way (sp) and he sleeved wheel cylinders and master cylinders in SS.
There’s probably others that do as well (***uming yours are pitted).

 

This place has 2 of the 521 wheel cylinders.
https://instockmotorsports.com/eis-521-wheel-cylinder-***embly-nos/

 

Thanks for the info, I will see about ordering some soon…