Replacement stainless steel fuel cap

[pbyrne]

i remembered i had this in the garage, it came of my Mk1 when i pulled all the deck fills (i think, or it might have been in a spare parts box from the PO).  if it fits, you're welcome to it

Thank you for the offer!  I suspect the shipping would make it a wash with a new one.  I was able to get a replacement at a reasonable price.

[pbyrne]

I was able to find a perfect match.  Pictures attached.  It was listed as a BMS Product but I there is no matching information on the box.  Sorry I don't know the thread information.  I just took a chance.

[KWKloeber]

Very cool, AND on sale. 

It's 1-1/2" NPT thread.
Just for the archives here's one brand that will replace just the cap:

Whitecap 6061C Replacement Deck Fill Cap
Whitecap Replacement Cap & Chain f/6123, 6123, 6125 & 6126 https://www.amazon.com/dp/B00TZLFNLQ