2000-2001 Ram 1500 brake prop valve options??

Anyone know of a source to replace or even rebuild a brake proportioning valve on a 2001 Ram 1500 2wd ?

OE part number is 5015419aa

Its no longer avail via Mopar and NO ONE shows one in stock .

Have a truck with a brake fluid leak and no parts to fix it

Could this one linky be a possible solution?

https://www.ebay.com/itm/324714890647?

Thanks
Ive found a few used ones. The issue is , have 2 trucks with valves leaking to some degree. Would prefer new or rebuild the ones we have.
These trucks are going to stay in service for at least a few more years. So used is last resort in fear they start to leak as well in short order. Then Im in the same boat

They typically just have o rings for seals. Take one apart and clean it, fit new rings and try it.

Alternatively, Ditch it and just put an adjustable one in the rear line.

FWIW, maybe of help https://musclecarresearch.com/mopar-parts

This particular truck is a spare , rarely used unit.
Once I can get my hands on it , I guess I will open the valve up and see if its repairable / new O rings will fix it . As Ive looked for days and found nothing as far as a new replacement or rebuild kit

What type material is brake fluid safe if I decided to get O rings ?