Found the FSU "only" part number on a different forum. NTB07-69A. Packing part # 17342-ea000.
Typically, when there is a high demand for an individual part, the manufacturors will offer that part separately. What's that say?
The other forum also said that many dealers will not have this part listed, so you have to ask for it specifically.
I haven't opened the tank up yet because you need a Kent-Moore 130mm lock ring tool to remove the retaining ring. The tool runs $85.00.
I ran it for about 20 miles last night, several at high RPM and she seems to be running fine.