Power Steering pump for 1990 Audi 100 solved

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Re: O-rings
 
I have found, that when in need of O-rings to look for a hydraulic line,  
and tool, repair business. Usually they have them by the thousands. A smaller 
 operation will usually sell you what you need. Be sure to bring the ones 
being  replaced so that they can Mic them for size. Learned this while trying 
to  rebuild a pair of 1964 convertible top pistons.