Paul,
dont know if they do 'capping's', doubt if there are cheaper copies,
possibly they can tell you who does do them if anyone can.
www.yrm-metal-solutions.co.ukor contact
www.strathearnengineering.comsee if they can supply them.
www.forfargalvanisers.co.ukNew ones on a hard top,
IMO as a painter,
really only need prepared properly (etch/primed) & painted & fitted with gaskets.
Or as you are wanting,
they can just be left as the Galvanised finish if you can get them.
Painting galvanished parts is yet another story.
Can you tell us about the problem.
(looked at the pictures you posted, & i see what you are probably worried about)
Common on older vehicles, surprised how it looks on yours being a 2001 vehicle.
is this the external rust issue on the cappings of your 110 below the hatch cover?
If so are they rusted right through & showing inside,
are they totally rotten??
I take it you going to remove the hard top & replace them now yourself?
(looks like lots of work on your vehicle)
Not really a huge job, just like meccano.(but its what you find as you dismantle)
i would be looking at getting then sanded down & rust inhibitor on & painted up
as a temp measure now if they are not rotted all the way,
at least untill you know if anything else is going to need work doing,
just so any more painting/respraying can all be done at same time, doors,bulkhead etc...
it must just be due to how the Conversion company did the modification to the hard top,
(no gasket/seal between hard top sides & cappings)
& just the salt/sea air & a working vehicle.
You will need to get a decent rubber gasket or sealer
between the panels when you replace with the new ones if its staying a hardtop.
I am asuming you are not turning it into a truck cab?
How is the bulk head corrosion?
is it all external/cosmetic?
Maybe post some closeup pictures of where the problems are showing.
george