I took the rear wheel off again to take a few pics of the tire rub marks and take a few measurements.

Looks like the car has a rear negative camber of roughly 1.1 degrees.

I measured the lip on the rear axle hub, it protrudes out 0.340 inches. But after looking at the inner wheel it appears that there is quite a large taper inwards to ease mounting the wheel onto the hub. The taper is 0.150 inches inwards thus without any spacers the wheels only has 0.190 inches lip support between the rim and the hub.
Looking at these measurements it is obvious that there is no way to put thin wheel spacers such as 3 or 5mm as there would be no support left for the wheel.

So i guess there would only be a few solutions to the rubbing issue.

One being as suggested to go with 285 or 295 tires as opposed to the 305 currently on the wheels
and the other being what was also suggested being put adjustable rear cambers.

I have a question about the camber links. If i would put these adjustable links, change the main center link to an adjustable one, would i need to do anything to the other link that is on the upper front side of the axle? If the main middle link is now slightly extended and the other front one is left the same would this create some toe in on the rear wheels?

I've attached some photos of this.

Input on this would be great.

thanks

S