Certainly no expert but I'd guess SW & Sun
Here is my SW fuel gauge.
Edit: Sorry Failed to comment on the rest of your post as I was searching for my photo I added below. Yes Cup mount was more common as Jim mentioned below from what I have seen as well. I'd have to measure mine but I believe its 2 5/8" going off the top of my head.
Last edited by cook_dw; 04-29-2020 at 10:29 AM.
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