Here is a master that is currently for sale that is much closer in appearance than that one for a Hemi application. I have used it, works fine.

https://mbmbrakes.com/1962-72-mopar-b-e-body-standard-manual-master-cylinder-kit/

'69 Hemi Charger 500, ‘70 U code Challenger R/T
(These and a bunch others at www.dkowal426.com)

P.J. O'Rouke: "The old car ran perfectly, right up until it didn't."