Having been shop manager for Bondurant for about four years I was around the SN95 projects for a while.....
And when I started doing brake kits Baer was using Vette (and perhps later Cobra) rotors from day one. Some cut to smaller diameter.
Having made kits to compete with them on the SHO my rotor was often .81 to accomodate the full size four piston caliper. A non-issue on the PBR. Wider rotors are great if you have room on a fixed design. I don't believe that Baer has ever offered a .81 FRONT set up for any Ford product, I could be wrong however, just don't know of it.
The info on the PBRs in enlightening. The very late parts (43mm I belive stated) are going to be way too much for the Contour. The mid size acceptable and the smaller ones ok also if you can find a real brake pad for that caliper. Meaning one of substantial Cf to boost torque lost in piston area. And leg will go up too.
There's nothing wrong with the PBRs for light track use. Like all products they have their drawbacks too. Extended high pressue use of some of these has also resulted in a bent or flexed bridge area, witness by the scrap bin we had behind the shop full of PBRs. Scary that some people advocate the grinding of the "cooling fins" on the bridge for better fit! Doh! Another issue on some of these kits is the hub (as stated on the Mustang, we later did steel hubs from WW for this reason- might be able to still get them for you) and the rotor being heavy and non serviceable. Very pricey replacements at say 12.5" had me make two part replacements for others who bought these kits. Pad choices are also an issue given many companies don't make 'real' (forgive me here but show me the data) race pads AND the simple fact that the pads are thin in nature thus don't last as long and transfer more heat to the caliper body.
Just some food for thought from the other side.