Don't believe partshops that tell you, this is for your car.
There is a lot of misinformation and especialy about the brakes.
The original rear disks are for sale again, but at the time I was busy restoring the brakes of my 2.2 they were not.
So I made a converssion to Alfa brakes (also 260 mm) using the original calipers.
This brakessystem has the same specs as the original.
The spacers you see between holder and mounting point are replaced by a solid spacers of 6 mm
This is mounted a few years now and working flawless.
Was dirt cheap to do, but I had the disks for around € 20.-, and machining the axle hole on the disks costed me some beer.