Jim, Does it have the 4X100 bolt pattern and the correct bolt size? (can never remember if it is 14 or 11MM which can be corrected with a stud coversion kit) That et and rim width should be no problem (I have 42 ET on a 7.5in wheel on mine with no prob)
The Rota 15X7 are said to not clear the rear arms without a spacer. I can't find out if theses are the same or not. Web site lets you ask no questions and the couple of sellers I spoke to don't know. Jim
Sadly there is no real way of knowing without trying. All wheels are made differently. The backpad and inner spoke design on the Rotas could be COMPLETELY different than the Konigs. Vendors would have to sit and test them on every single model of car to know. That's just part of fitting wheels. Sometimes you run into issues and sometimes you don't. Luckily, if you find you need spacers, they're affordable and easy to get.