7.5 with ET49 is going to be close but i reckon you'd be okay.
Although now i'm looking at your rears too - is there 15mm extra clearance behind your existing rear wheels?
You're going from 8.5 to 8.5, but ET37 to ET52.
Yep, you need to put your hand over and behind both front and rear wheels. You'll need at least 9mm up front and 15mm at the rear to not touch the suspension.
Ideally you need a complete set of 20mm spacers...