Correct Proportioning Valve?

I have never seen one that looks like post #1, so might have come from an Aspen/Volare or such. It also appears to have 2 electrical connectors. A-body ones only had one connector for the "pressure imbalance" switch. An adjustable prop valve is good, but only if you adjust it. Ideally, skid in a wet parking lot, adjusting until the fronts skid just before the rears do. Pickups are where the ratio needs tweaking with load. Some have an adjustable prop valve with an arm that senses how much the bed is loaded. Not sure how well that works or if reliable.