For the E30 A/C system, the main line-fitting O-rings are standard SAE sized. BMW confusingly identifies them by the O-ring’s approximate ID rather than the hose size and does so in mm.
Because of the standard SAE sizing, you can can order oring kits much more widely and readily from suppliers like four seasons or your local parts store.
The only odd oring out is 64508390605 (6.8mm) which is for the pressure switch.
| A/C Fitting Size/ SAE Standard Sizing | Typical E30 use | ||
|---|---|---|---|
| #6 | Drier connections, condenser outlet, liquid line/firewall, expansion valve | ||
| #8 | Compressor discharge, condenser inlet, expansion valve, some drier switches | ||
| #10 | Suction line/firewall, expansion valve, Denso compressor suction | ||
| #12 | Bosch compressor suction / early compressor arrangements |
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