Notes for those who may follow.
The parts catalogue says on page 77 that the rain gutters were held on with self tapping screws. Mine were held on with pop rivets. They were installed at the factory before the body received any paint or even primer, thus there was no paint or primer in between, except what little wicked or leeched in there. There was dirt and rust in there when I removed them.
I decided I wanted them fully painted, so I did them separately.
These notes are for re-installing the original mouldings using their original holes.
I found they are awkward to install single handed. Here is how I did it.
Start at the middle and put in one pop rivet just to the rear of the B post.
Then do the rearmost pop rivet.
Do the foremost pop rivets. Mine has two on each side at the front.
Work from the rear towards the B post.
Work from the front towards the B post.
I found an awl a handy tool to line up the holes.
The pop rivet size is 1/8" diameter x 1/8" long, also marked on the package as 3mm x 3mm, but in reality they are a bit longer and the stated length refers to the maximum amount of material they will hold.
I think they need some sealing in there so they won’t collect dirt. Tomorrow I will drip some thinned out paint in the gap with a small nozzle and a syringe.