I am looking for what I believe is a pre 1960 fuel tank to fit my Manta Ray. Ideally it would have a central filling hole on top but I'll take whatver someone can find in their store/shed/attic.

The tank is about 32 x 64 x 13 cm with a flange around the top edge.

well that tank looks more like a sherpa/ldv 200 van.ive got a few early tanks £35.im coming down to somerset this week.poss drop  off on way back.your main problem is getting the old one out as manta rays dont have separate bonnets.

I bow to your knowledge of ancient fuel tanks.

Happy to take delivery of a sherpa/ldv 200 van tank if you think it'll fit in the space and I can get the filling cap position moved.

Yes changing tanks is going to be interesting. There looks a small chance that the existing tank will unbolt and wiggle/slide out....if I'm lucky. That would certainly be preferred if not least to speed up seeing the exact positioning required of the new filling cap and getting that made up.