Follow-up, contacted "Sino-SD" ebay seller. Guy was quite helpful and seemed genuinely "keen" to be sure that I was ordering the right stuff ( I already had a "B series" Multifix set but wanted to add 3 more tool holders). Several messages back and forth, finally sent photos of what I had, from the photos, he could identify the original mfr. Apparently, some are "fine grind" and others are EDM cut, I had a "fine grind" tool post and EDM cut holders.
Placed an order for 3 X B2-BD25120 tool holders on May 26, had them on my doorstep 10:00 AM May 31- 5 days from China (Fedex).
Fit perfect.