HELP!-Collet ID

[GripThis]

Hello All!-Newbee!!!
We Have A NASA Machine 3-Spindle Mill, But The Collets Have No ID!-
Would Like To Find 3 1/4" Collets-Any Help Appreciated-
Thanks,
John

[GripThis]

The Collets Measure:
Length: 2.175"
Small End: .630
CounterNut:.650
Again, Thanks
John