I don't know if this will be of any use to you as my car is a 4/4 and it was fitted with twin fillers when built in 1982, in fact I think 4/4's fitted with twin fillers are a bit of a rarity. Anyway I have taken some dimensions from the rear panel of my car allowing for the curvature of the panel as best I can. I hope this will be of use to you if nobody with a plus 8 responds
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![[Linked Image]](https://www.tm-img.com/images/2020/01/30/GEDC0029.jpg)
![[Linked Image]](https://www.tm-img.com/images/2020/05/11/rear-panel-page-001.jpg)