Any GM disc drum prop valves stilloavailable

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I'm going to ditch the ABS on my 97 Chevy pickup finally-been an issue since new. Those years were always an issue on a variable pedal. Engage ABS and great pedal for awhile, great pedal in morning, after much driving pedal goes away some and seems to do little. Multiple MCs and booster is good. Even added SSBC MC for these years ago that helped a little.

I know my 92 truck had rear only ABS. I was wondering if any F body, B body, truck in the late 80s 90s before ABS prop valve from GM still available. I've heard mixed reviews on the aftermarket replacements and most of them are standard threads vs metric.