That is a German mail orderer who does stuff in Ducati and Moto Guzzi. And your contact person Janina Spatz speaks fluent German and English. People who want to keep it pure Dutch can go to Robers Motoren in Boekelo, SD's local partner,
Currently there are calipers type 05 on sale. They fit with their HoH distance of 95 mm on many classic engines from the years 80 and they cost the unlikely amount of 105 euros and 1 cents each
www.stein-dinse com