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My absolute favourite Wilesco parts dealer for more than a decade, is Peter Schaefer in Germany.
Just checked with him, and looks like heŽll ship a set of 5 to you for just around 15 bucks, including shippingcosts.
https://www.ebay.com/itm/WILESCO-Z-827-ANTRIEBSSPIRALEN-500x2-5-mm/164197170579
I know youŽd be "importing" then, but assume everything from Wilesco is imported, one way or the other
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