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Originals have the number 38787 cast on the side. Repo 1/4" bleeders have been available for the past 1-2 years...check NPD. Not to say yours is a recent repo but possibly replaced back in the 70's or 80's.
I doubt they're a repo. NPD does offer a concourse correct unit, but they're 100.00 and they wouldn't accidentally wind up on the vehicle. The parts store replacements run about 10.00. The replacements I have seen via most parts stores have a 3/8" bleeder. I haven't seen any with the 1/4" bleeder. -Keith
Repo was the wrong word, should have said replacement. I went through this a couple years ago and according to PO's service records, he replaced them in '74. At the time I only came up with 38787 but as Charles mentions, 2 vendors may have different numbers. If OP turns out to have originals, I would rebuild also.
No, the 1/4" bleeders are reproductions of the OE. The 3/8" are what is offered as a replacement. We're on the same page. -Keith