I have the same car. You can use the same calipers used on a Euro 280 SL, which was officially imported to the US, but not the 300 SL. There is no part supplier in the US who can supply you with any part for a Euro 300 SL. I had good luck with Cardone, who rebuilds calipers. Take your old caliper off and look for the part number and call them. A lot of parts are the same like on other 107's, except for engine parts. I hope that helps.