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Sold my C5 RS6 which these wheels were on.

19” 9J ET 33
Rare offset to find but the only offset that will fit C5 RS 6
£1950

Genuine Centre caps included
Spigots also included.

As new
No damage / buckles

Not suitable for an RS5? ET26 for those.

Not sure if the RS 5 offsets vary between models/years ?
C5 RS6 is a definite fit.

Example. The offset on a stock C5 RS 6 is ET28
You cannot typically go to a negative offset eg fitting wheels with say ET 26 without it possibly impacting someting, eg tyre catching on suspension arms, calliper catching inner wheel. However a bigger offset than stock , in my case, anything from ET 29-33 positions the alloys further away from hub, brake disks, callipers etc...
the nagtive of that is the risk of catching wheel arches.
For the C5 RS 6 an ET 28 to ET 33 means the alloys are 5mm further out in the arches which is a perfect fit.

For the RS 5 with an ET 26 to ET 33 would be 7mm, typically, edge of finger tip - so it might be tight.
Most cars have a fingertip clearance - approx 10mm

However, you can dial that out depending on tyres, and ride height. So if your running stock suspension setup, 7mm is going to be tight, but probably doable.
if the car is lowered, eg with coil overs, it might be more problematic. In this situation you would increase ride height and look at different tyre profiles, eg those with a more rounded tyre wall. You can also go slightly stretched on tyre profile - eg from a 255 wide tyre to 250 wide tyre. That’s going to extremes though.
I went with Pilot Super Ports, which were probably more squarer than I wanted but it still wasn’t an issue.

However, on the plus side, that extra 5mm made a world of difference to my rs6 drivability, that slightly wider footprint. It just made it feel more planted and squatter. With the wider arches on RS models there’s quite a bit wriggle room to play with. Anything upto 5mm would be ok, 5-7mm is tight but doable with the right tyre profile/suspension setup.

You're miss understanding offset. In the RS5 case, the extra 7mm which your ET33 wheels have, means that you are bringing the wheel centre line back towards the suspension strut.

Use this website to help, the link has the RS5 dimensions and yours as an example : https://www.willtheyfit.com/index.php?w ... offset2=33

I'd suggest you edit the RS5 out of this advert as there could be potential calliper clearence issues, especially if running ceramics.

If possible try before you buy, this is the only way to make sure.