Let me try to speak in your language across the pond: "cup spoilers" - if you are referring to the wings on the front splitter, then no. Nil hits on a "kerb", either side. The rear diffuser flaps have seen a right few scrapes, they have. The racing stripes are factory installed, they are. Adds 5 hp each, they do.
One thing I LOVE about England is you seem to know the difference between a "wheel" and what Americans under the age of 35 refer to as "rims". They are wheels people. The edge of the wheel that keeps the tire from falling off IS the rim...of the wheel. To answer your question, they are 17x7.5 XXR 527. 5 pounds....sorry, 0.36 stone lighter, each, than stock wheels. I only went one size wider than stock with the tire @ 215/40/17. They fill up the wheel-well a bit more, so I get a lot of questions about, "Is it lowered?". No, they are stock ride height.
I used to have an Eibach rear anti-sway bar (you can see it in the last picture just peaking out between the left rear tire and the diffuser). Made a HORRIBLE creaking sound going over speed bumps....sleeping policemen...and even just getting in and out of the car, you know. So I had to take it off at the wife's behest. She said it sounded like something was broken and quoted Jeremy Clarkson, "You've ruined it." No, it was just creaky and squeaky.
Yes, that is a brand new Ford GT I am parked next to in the second picture.