Upper Ball Joint Grease Boot (fit???)

The measurements on these are just about identical to the boots that came with the old school Moog K772 ball joints. Those are the ones which are replacements for the '73 and later A-Body uppers. I haven't found any other original style boots available.
New Replacement Rubber Ball Joint Boot for Moog K6145T Style Ball Joints | eBay
Thanks! I was actually thinking along the same lines after looking for a bit online and seeing several references to the K772 ball joints.
Also found these boots from speedwaymotors.com
Replacement Screw-In Ball Joint Dust Boot, K772 Application

Hopefully I can find a good replacement, but I'm pretty disappointed with PST. I'm not happy about having to buy separate replacement parts after buying their "complete" rebuild kit AND contacting their customer service. But I don't have time to keep calling and arguing with them. I'll eat the lost cost and just make a note to take my business elsewhere next time.

I appreciate the input!