From what I have read, I have to ask if you are a regular member of the KFOCI? The club Manufacturing Fund ran stainless steel gas tanks that are exact copies of the original item. 1947-50 tanks, 1951-55 Kaiser Tanks, Allstate, Henry J and Darrin tanks (they are the same) have been run, work fine, and cost a heck of a lot less than $1,100.00 including shipping. Willow Run parts also has new sender units that work with 6 volt systems.
Manufacturing Fund avaiability lists are reguarly posted in the KFOCI Monthly Bulletin. If you don't see something, contact Adam Harder; his info is in the list.
For those unaware and reading this post, being a member of the Forum is NOT being a member of the KFOCI.