Anybody identify these rotors

[Guy67UK]

Firstly if this is in the wrong place please can an Op move it.

I have recently bought a 67 C10 Stepside and shipped it in from Texas to the UK, well it has got a few issues I didnt know about most of which I have now sorted (wiring etc) and some I am going to leave for a year (paint). To get the truck registered over here It needs to be road worthy. Well the brakes are shot. The pedal was going to the floor with very little effort thankfully the emergency brake worked (just). I found the rear brakes had siezed adjusters on both side now sorted. The whole system was bled but no pedal, the master cylinder was changed as was the booster no pedal. The truck had been converted to power discs and I read on here that power brakes needed to have another hole lower down on the brake pedal that was drilled and I got a fantastic pedal thought my troubles were over untill I went down the road and the same result..... no brakes. I now pulled off the front wheels and check out the calipers and rotors and found the caliper at the far end of its travel on the sliders as the rotor nis well below its min thickness and all the wear is on the inside edge of the disc..
I dont have a pepboys or autozone down the road to go and identify what the discs are off and will have to order them in and dont want to get the wrong parts over. So can anyone help ID these rotors. they have a 4.75pcd and are on a Western Chassis dropped spindle

I hope someone can point me in the right direction with this

Guy