I have one for my 123 and Phil at Fastlane gave me the part # for a 116. I switch back and forth for road trips. The part #1408900014 and is only a few bucks .

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2dieseljohn
1979 300sd (283,000+) Road Trips
1983 240D 4-speed (350,000+) Daily Driver
1967 E-TypeS1 in bits and pieces