Replacing AC system Orings

[Dave C]

 Back in June, Peter Schultz wrote ...
"I'm about to get the R134 conversion charge to last longer than a year -
will replace the accumulator and the orifice tube, and while I am at it, the
orings... Question is the orings speced in Bentley measure all measure a
width/thickness of 1.8 mm and an ID of 17.2, 14.0, 10.8, 9.3 mms... Where
can I find them? "

Hey,
With apologies for the slow response ...

I believe all these O-rings are actually standard fractional inch sizes
which Audi nicely converted to metric, ending up with these odd sizes.
Dave C.