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Frankly, bits vary in shape and size considerably. Even if an antique that isn't made anymore, we need the internal measurements and an idea of the geometry of the neck to properly help you.

Tnx!

Pairs of CONN bits and pairs of OLDS bit both feature two IDENTICAL bits which are both STANDARD shank...

...so - IF your neck's receiver is STANDARD shank - one or the other of those might be the easiest to use.

OLDS feature a SHARPER BEND than CONN.

CONN bits (pair) found on eBay: https://www.ebay.com/itm/Conn-Sousaphon ... 3866760918

OLDS bits (pair) found on a store website: https://www.1800usaband.com/products/view/790

Tnx Joe

In the diagram, Conn are the A211, and Olds are the O-XXXXX-1

In that diagram, is the S-150/151 for a Selmer?
I don't see it in the table on the bottom right.

Kirley wrote: ↑Fri Feb 19, 2021 1:13 pm In that diagram, is the S-150/151 for a Selmer?
I don't see it in the table on the bottom right.

Selmer/Bundy/Buescher (Selmer USA Buescher), Signet

' sorry for the previous (unnecessary) post...I didn't originally notice the "key" at the bottom.

bloke wrote: ↑Fri Feb 19, 2021 5:02 pm

Kirley wrote: ↑Fri Feb 19, 2021 1:13 pm In that diagram, is the S-150/151 for a Selmer?
I don't see it in the table on the bottom right.

Selmer/Bundy/Buescher (Selmer USA Buescher), Signet

' sorry for the previous (unnecessary) post...I didn't originally notice the "key" at the bottom.

Yes. I had a Signet for awhile. It is kind of a "poor-man's 14K/36K" (mine was fiberglass). The Selmer USA - Bundy - Signet neck is weird. I replaced the neck on mine with a Jupiter neck and bits, as the male end of the neck was close enough to the internal diameter of the receiver that the thumb screw could still tighten it without deforming the receiver.

This is what the OP may have to do: measure the internal diameter of the receiver and get a neck that fits, and the accompanying bits, if he doesn't already have a neck, or a neck with a strange geometry.

' never before noticed that Selmer and Jupiter were so close...thnx!

I believe I have some spare Jupiter male connectors (because it's so easy for kids to trash the rest of the [thin-walled] assembly).

Until I use them up, I've been "Conn-izing" them...(loading them up with Conn curved/tapered tubes and receivers, and reusing the brace).
Built back that way (to use on J'ter), they tend to last much longer than stock J'ter, and Conn-Selmer sells those curved/tapered tubes, so...