Scott-
The originals come up from time to time on ebay, banana_brain aka Baron has had quite a bit in the past.Might check his ebay store and or email with an inquiry, often been sold in lots of 2 or 3 pcs.
13ron has also had some, one must look closely as some who sell this as original are selling similar stuff but it does not have the stepped end that fits into the "diving bell" chainstay braze-on.
Drove by Baron's place last Saturday with the kids on a zoo & train adventure, they were closed up at the time, been open in the past, maybe taking a rest.
John Jorgensen
Torrance Ca