Good idea - I'll check the pad part number I have those, yeah i've been looking and Focus looks close, would just need a shim made up to sit between the mount and the caliper.

The only uncertainty is the diameter clearance, I'll have a look at that site you mentioned!

91 escort, yike.. that'll be annoying to source pads. Seems Focus mk1 or mk2 calipers look a better option.
You've got the setup now may as well carry on with it.
Cross reference this with the 90s fiesta etc

RDA7933 Fits Ford Focus R/Rotor

Specifications:

Diameter: 252.5mm
Height: 33mm
Centerhole: 63.5mm
Thickness: 10.4mm
Minimum Thickness: 8.9mm
PCD: 108
No. Holes: 4
Type: SOLID

Good thing we have the Ford Kak until 2003ish . A wider rotor shouldn't be a problem with floating calipers as long as it spreads wide enough

Ok we got discs! 

I dropped down to the local brake place with my handbrake cable this morning, while I was there I asked if they could get the KA discs and I was floored that they would have them by this afternoon . 

Then I made a tactical error that my arms are now paying for... I offered the discs up and saw how little material needed to come off the axle hub to have them fit... so I decided to give it a crack with some emery cloth to get the discs on instead of removing the axles to take them to get turned down...  

Long story short the passenger side is 90% done.. It still needs a tiny bit more to rotate on the hub freely. Pure stubbornness on my part was the only thing that got this done - it took almost an hour of filing and sanding to get it all the way home on the hub...
 

 
So that revealed the next issue, the caliper needs a spacer, it's about 5mm off. 
 

 

 
That washer is just under 2mm thick, so A 5mm spacer should get the job done. I've ordered some aluminum ones off ebay that should arrive early next week, in the meantime I have more sanding to do....

I hope you have an easier time of it, these have been painful, managed to get them sitting right with a bit of work with the file and two 3mm washers, I might actually tack them on to the caliper mount cause I have to repaint it anyhow, it got scratched to all crap. 

Ok well that job sucked but it's done now, both rear discs mounted and caliper mounts now have correct clearance. The right side needed slightly less shimming than the left. 
 

 
 
 
I made sure the discs were clamped to the hubs to that the disc was in the correct position and rotated everything, the disc runs true and there isn't any warping in the axles which is nice. 

Next is cleaning up the caliper mounts and re-mounting them and getting some longer wheel studs - any recommendations on the wheel studs before I go shopping around?

Hmm, my previous posts seem to have disappeared 
 
Oh well I'll say it again, great progress, it's looking good under there...
I used these guys, Nice products, when I went looking for my wheel studs. I also got some hardened chrome wheel nuts as the chrome from the originals flaked off first time I fastened them.
Home Page
 
I've supplied the link so you don't make the same mistake I did and type 'Nice long studs' into the search engine. Once you've seen the results you can't un-see them😂