Searching for an alternative gas cap

I have my Tourtank but want to tap a fuel line through a gas cap. Since I don't want to ruin my stock cap, and the locking mechanism would preclude me from tapping it, I've been looking for ways to get a special lockless gas cap made that will fit the Swing. However, someone also told me that the Helix gas cap would fit, and someone else suggested that an old Elite 250 might also have a gas cap that would fit. Do any of you have access to a Helix or Elite and can tell me if the gas cap will fit on a Silver Wing?

Thanks!!!

Take your cap to an auto parts store, there are lots of generic fuel caps available might be one that will fit.

Hammy wrote:

However, someone also told me that the Helix gas cap would fit, and someone else suggested that an old Elite 250 might also have a gas cap that would fit. Do any of you have access to a Helix or Elite and can tell me if the gas cap will fit on a Silver Wing?

https://www.silverwing600.com/silver-wing-topics-f3/help-need-new-gas-cap-t2119.htm#18502

Or a Reflex cap.