@Zac_Sonic I'll need your help with official stickers and placement to make these cars appear as they should in the real world.
@Duke This information is assuming that you DON'T change iRacing's default "decal sheet". Its a little short notice, and I don't want to dump that on you.
It looks like the class that the Porsche 911 GT3 Cup (991) will be representing is known as "SP7". Bilstein appear to have a decal centered in the front bumper of ALL cars running this race, and Falken appears on the trailing edge of the front fender on ALL cars running the race DESPITE the series being
open tyre, so the Falken logo appears along side Michelin, Dunlop, Bridgestone, and Yokohama. Its weird, but whatever.
There are few consistencies between cars, not to mention classes. There are no class "colors" or identifiers that I can find. The only consistencies I can find are; Falken tyres, Bilstein shocks, and Zurich Insurance Company.
Falken - I, personally, like the layout of the #61 car, with Falken on the trailing edge of the fender, the Michelin Man below. However, the #150 car scrapped the Michelin Man, pushed the Falken logo forward, and put Bilstein on the fender instead of on the front bumper... *sigh*
Bilstein - Should get one sticker centered on the front bumper (there is room below iRacing's Michelin logo) AND, either; one large centered logo OR two smaller logos, centered on the rear bumper.
There should also be a Bilstein's logo on both sides of the front bumber (below iRacing's 'Mobil 1' logo), right in front of the front wheel, and on the rear bumper right behind the rear wheel.
Zurich - iRacing's Cup car places the car numbers quite high on the door, so I would recommend flipping the number card layout, and just put a large blue rectangle with a white outline UNDER the existing number with the "ZURICH Z" Zurich Insurance Company logo in it. In the short time frame we have, I feel that would be easier than trying to build an entire "Decal Sheet". There isn't a 'standard' number location in this series, and iRacing doesn't let you go moving the number around, so I wouldn't fuss over it too much. The Porsche Cup number board looks pretty nice anyways!
Other ADAC Zurich 24h partners:
- Gran Turismo: "The Real Driving Simulator" #KappaPride - GT gets the windshield banner of all cars... however, this may violate iRacing's ToS...

- Deutsche Post - Listed partner, but haven't seen their logo on any of the cars