hepco becker mount

Advice needed: Mounting pannier rack on R90/6 Bike is question is a '74 R90/6 with a solo seat. Back in January or so I bought a set of Hepco-Becker reproduction luggage racks for the Krauser-style bags. The racks were advertised as fitting the MY 1970-1976 bikes. I *finally* got around to...