Replacing AC system Orings

[Peter Schulz]

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?  I checked McMaster Carr online catalog, and 
they don't stock those sizes....e.g.  1.6 mm thick 17mm id...

TIA

-Peter

-Peter Schulz
Chelmsford Ma, USA
http://www.naaclub.org/

1991 200 20v Q Avant Titan Grey
1991 200 20v Q Avant Indigo Mica
1991 90 20v Q Red

1990 CQ silver (awaiting S2 engine transplant)
1991 CQ silver  (potentially replacing the 1990 for  the transplant)
1990 CQ red ( to part or not)