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You can find the offerings on the TechArt website. I liked them a lot and looked into them for my Spyder, but if I recall, the offsets are targeted to the 911 models with I think a 50 et for the front wheels, which isn't great. I had Carrera II Lightweights on my car with a 50 et when I bought it and took a turn with a mid corner bump that caused the tire tread to catch the front fender lip. Luckily it only bent the lip and not the fender. That was the last drive I took with those wheels on the car. I ordered some with a 57 et for the front (only ones I could find that I really liked and the look is similar to these TechArts) and I rolled the fender lip for extra insurance. You really want something closer to a 65 et for the front.
Here's what I ended up with - made by CMS out of Germany - unfortunately they're not distributed in the US. Had to go through some gyrations to actually get them, but really like the look on the car, so worth it in the end. Front wheel stance is just about perfect and didn't have to add a lot of negative camber. Running a 235/40-18 Running a 295/35-18 with a 15mm spacer in the rear, but my fenders aren't stock