I already have the US Headlamp Washer system, so reservoir and hoses etc. are already in place. My question is how to install washers for the Euro Wiper Arms that do not have provision for a washer.

One thought was to install a windshield washer head on the headlight trim plate aimed at the headlamp.

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1991 M-B 560SEL Arctic White/Grey 99,000 Miles
1987 M-B 300SDL Ivory/Palomino 229,000 Miles (sold but never forgotten)
2006 Volvo XC70 Blue/Beige
1999 Porsche Boxster Arena Red/Savanna Beige
1986 Porsche 928S Goldweiss/Brown