Hi Jason
I enquired with these guys regarding the RDA7103S which I think is the 283mm x 22mm rotor required. Just make your own enquiries prior to purchasing. I think they're pricing is also quite reasonable.
http://www.onautos.com.au/casearch.aspx?SearchTerm=RDA7103S
 

Paul thats correct. I used the RDA7103S slotted 283x22mm with your brackets and Rx7 callipers. If you dont want slotted just remove the "S" in the part code.

You will need to have the discs re-drilled to suit the hub your are using as the discs were originally a Citreon or Peugot drilling.

I did also have to machine one of the brackets (other one was ok) down 2mm so the disc sat centrally aligned to the calliper, but this may be from a number of things and i dare say was just variance in good old Ford production or something to do with the strut and brake mounts on the strut. Note im using 2.8i struts not escort should that make any difference?
For pics i put some in my (very slow) build thread. 
http://www.classic-ford.o.../tm.aspx?m=54511 

Paul,
 
What size are the pistons in the RX7 caliper?  I've been a googlin' but seen some conflicting info.  Hoping they are about 1.5" (38.1mm).
 
Also, based on that googling session, it appears that the Series 2 and 3 brakes are essentially the same (although cosmetically different) but for the disc size used, the Series 3 (FD) being larger.  Do you whether that is true, and hence whether Series 2 brakes could be used with your brackets?
 
Anybody know what RX7 calipers are selling for these days?
 
Thanks.

I found people wanting way too much ($300-400) for them here in Australia. As most you would want to do a full overhaul of them anyway..
I just bought mine from the US via ebay. Then got them Soda blasted, and repainted them myself.
Something like this (these seam a bit grubby though but obviously you'd just need to clean them up).
http://www.ebay.com.au/it...p;_uhb=1#ht_2713wt_986
 
Then you'll need an overhaul kit.
http://www.ebay.com.au/it...=1#ht_2163wt_986 
 
Just keep an eye open online and at wreckers, there actually seems to be a couple cheaper ones on ebay at the moment locally. 
But unless they are fully refurbished and overhauled i wouldnt really want to pay any more than $200..?
http://www.ebay.com.au/sc...ipers&LH_PrefLoc=1