Proportioning valve question for disc brake conversion

Oldmanmopar said
Are you sure you have a proportioning valve and not a distribution block? If you have a proportioning valve they are rebuildable. Here is where to get the kit

1970 - 1976 Mopar Combination Brake Valve Seal Kit | Muscle Car Research LLC

I don't know exactly, but my braking system is totally stock.
I think I have the same proportioning valve than the one in picture posted by Oldmanmopar.
Usage status after 51 years of loyal service

I preciously keep the two links for the brand new valve and the seal kit. Thanks a lot

François