Eric, those do look familiar.
If you are interested, I could check at my own local tool store this weekend and see what they have.
I will take your measurements and my calipers with me.
I can let you know prices and see if you're interested.
It was a 3/8" DIN 6388 type B25, right?
-brino
PS: I thought I had posted a picture once about teh baskets of collets they had in stock at the time...but i could bot find the picture.
Nope. It's Cardon Tools just down the road from me (about 15 min door-to-door).
Here's their web site: https://cardontools.com/
(Full disclosure, I do have some family members that work there....in fact that website was built by my son.)
Oh, and I found one picture of a box of various collets.....
If you cannot read the tag it says $10 each.
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