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There is no universal standard. The OEM Sachs I've pulled were mostly 21. The Bilsteins I've installed were mostly 19s, but I think I've seen 17s and 22s. Might not have been beemers...
Removing with air tools is OK, but installing with air tools is NOT. The cut-out sockets are crap. A GearWrench pass-through socket set is well worth the price.
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