Greg5OH

I believe the 4.2 FSI has the same compressor as S8.
When I took my lines off to take motor out, one line has 2 O rings, the other line has 1 O ring.
In all diagrams I can find and Audi dealer has, it shows only 2 Orings. I got them, 1 small 1 large.
I am missing the other lines large O ring...does anyone have this part number?
Or would a generic AC o ring from a master kit work? I knwo these Audi O rings are strange size, like 2.5mm thick by 28.2mm OD..

I already have:
8E0260749C
4E0260749A This is the small diameter one that goes on the end, and I am missing the yellow large diameter O ring that goes behind this small one.
These are purple in color

Thanks

MP4.2+6.0

EKTA (Audi parts listing speak) only shows what you mention apparently. See below for V10. Same ones shown on the V8 diagram. Sizes for these are listed with the part # in the diagram. I looked at W12 diagram too, and same thing other than belt driven since it stayed port injection. Is it possible the lines were previously pulled and someone made an error in doubling up o rings, or fitted an extra to try to deal w/ a leak or some such?