Euan,

Assuming I have photographed the correct piece, this is how the brackets on mine look. Not exactly like your posted photo. I like yours better. Would be keen to see the repro pieces you have. Though this type of roof is not indigenous

to my truck, I really like the look and will install one. I have several cab rooves, so I can do one with a hatch as well......later.

These are the shovel holder parts I saved.

This is the sun visor bracket I removed. Was this original??? If so, I will see that it gets reinstalled on my roof.

These are the surviving parts of the canvas tie down at cab rear.
I also saved the remains of system of securing what I guess to be a canvas cover for rear window opening. Sorry I didn't take photo of that this evening.
When I said 'scrap' for the cab remains after I finished, it really was devoid of anything useful. I even kept the best of the two metal rifle butt blocks. Well, best as far as you can still tell the dimensions and has the original felt lining, which is totally buggered, of course! My Tetanus inoculation is up to date!
In my next posting you will see why I got sidetracked just as dusk approached