Looks like all of mine are type A, they have the low profile nut on them at least. I ordered two complete liquid posts and to exra poppets. I have a couple of posts htat are a bit dinged right in the opening where the seal pushes up against. The one that failed just seemed to not push up completely, probably a fatigued spring or rubber seal.
I got all my kegs used for $20 so I suppose its time to pay the piper. It was tempting to just buy more kegs, the liquid post alone was half the price of the entire used keg.