Aluminium wheels new A3

Hello, I also ordered an A3 2.0 TDI ambition about 5 weeks ago. Unfortunately you have to get there until the car is finally there, even think about the winter tires. With the summer tires there are no problems with the look of the aluminium rims, yes. I ordered the rims in a 5-spoke star design. For the winter bikes Audi offers somehow nothing really great about aluminiums. I find the Tecnic or ZW3 Tecnic from RH quite good. However, these are only available in the G push 8Jx17H2 The Audi rims have a size of 7.5Jx17 Can I take the rims despite the other size and what does the abbreviation 8J or 7.5J mean at all? The tyre size is given for both rims at least equally. Thanks for your answers! ciao Chris