Bypass hose nipples

[jeffschevelle]

Is anyone aware of a vendor selling repro big block bypass hose nipples that are correct for 65-66, and 67 before they added the bulge or lip to the end? (I think that lip was added somewhere around May of 67.)

It is basically just a straight pipe, no threads, no lip. I can only find this style with the lip: https://www.ebay.com/itm/375500603824

If no one is making the 65-67E version, does anyone happen to know the specs of the pipe they used (O.D. size, and wall thickness)? Maybe I can just buy some pipe at the plumbing store and cut out my own.

Thanks!