Ahah! I found it... I made my own..

So I was trying to find a brass bushing that fit, but none could be found with the external ⅝-18 threads, and the ⅛" internal.
I found a correct ID bushing, and tapped the outside (died?) to fit the ⅝-18 threads.
The tap cut the soft brass like butter and lo and behold (what is "lo"), it came out perfect. Shown is the sender in the bushing, in the head for a fit check. Will goop it up with pipe sealant when assembly is final

Lee
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Lee

1981 C10 "custom deluxe" stripper in white "Ralph"
Will work on any classic