Short version: I'm trying to figure out which spec front discs and pads I should order to replace OEM Cosworth 2wd stuff on my XR4TI. How do I know what to order?

Long version: I saved a couple of abandoned XR4TI projects here in Florida (USA) and am working on getting one of them back on the road. The previous owner said the front discs were Cosworth 2wd (with OEM 4 pot calipers), but he couldn't give me any more specifics. Since we never got the Cossies over here, information and knowledge on these sorts of things isn't readily accessible, and I'm confused by all the different model year cutoffs and part numbers listed for different discs and pads. What I do know is that the discs are 283mm in diameter, and I verified the calipers do indeed appear to be OEM 4 pots. How do I know what to order? What specs should I look for on the discs? What pads fit the calipers? Are there significant differences between different model years?

Any help much appreciated. Cheers.

Pic of the cars after I found them sitting for 5 years: