Name of Series 2 Fuel Hose Cover Panel?

slightly obscure but I was wondering what the panel is called, if there is one, that covers the fuel hose from the filler cap on the underside of the vehicle? And where to get one?
Filled the tank by removing the seat previously but have since installed the traditional exterior filler cap with pipes. Every time it’s wet now the tyres flick up water into the cab! In wellies most of the time but not great when wearing my dancing shoes.

https://rover.ebay.com/rover/0/0/0?mpre=https://www.ebay.co.uk/ulk/itm/282166037607

Look around for one of these.

And no. I wouldn’t pay that much either.

I’ve installed one of those on the inside but it’s the underside that I need sorting where the pipes go through the bulkhead. I’ve attached a picture. Could this been adapted for that space?

I think this is what you need, seals top of tank to under side of flat plate behind seat?

https://www.johncraddockltd.co.uk/504233-jc3-sponge-for-top-of-fuel-tank-1958-1998.html

Not sure there is one for a custom retrofit.
Best thing I can suggest is a sheet of tin and a big ammer.