The hose size is metric. A US size will be very difficult to seal. I ended up with slight weeping which ended up coating the inside of the windshield with coolant.
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So what's the Metric size? The hose is not original and markings area hard to read. Each end is held in place with a regular clamp. Like to swap those as well. There are several part stores catering to euro car market.
1984 Moto Morini 3 1/2 Sport
1990 BMW GS100
1991 Bimota YB10
2001 BMW 525i Touring
2007 Mercedes R350 AWD
2004 BMW Boxer Cup Replika 193/300
PAST RIDES(abbreviated list): 1969 Spider 1750, 1969 Berlina x2, 1974 Spider x2, 1979 Spider, 1982 Spider x2, 2001 Jaguar XJR, 2011 BMW 328i, 2002 BMW R1150R, 2004 BMW Rockster Edition80 169/2003, 1968 Firebird Convertible, 1968 BMW 1600