The rears will fit under 16x9 Fuchs no problem. The fronts are REALLY tight. I don't think they'll fit the 16x7 or 16x8 951 Fuchs without spacers.
The reason I say the fronts likely won't fit the 951 Fuchs is because I had a similar front brake setup with a slightly smaller diameter rotor. These rotors Jay has are a bit larger than mine and that pushes the caliper further up toward the wheel barrel. The problem with the Fuchs is that their center is the same as a 15" Fuchs. So the barrel of the 16" wheel is tapered to meet the center section. It's that taper that creates clearance issues, even with the 951 Fuchs that were purposely designed to have more brake clearance.
My front brakes used a Wilwood 309mm rotor and the calipers were basically the same size as Jay's. It was a really tight fit inside a 951 Fuchs. So tight that the rubber cap on the bleeder would rub the wheel barrel and the balancing weights couldn't be placed inboard behind the face of the wheel. But under 16" BBS 3 piece wheels (the common 34 bolt RS street wheels), and even the one piece 16" BBS wheels, the hybrid "custom" 993 brakes cleared easily. So unfortunately the original Fuchs are a bit finicky when it comes to fitting brakes any larger than 930 brakes.
993 caliper upgrade, can I use 951 Fuchs?