I have had some interest in what I used for my fuel filler set-up. The parts can all be found at mittelmotor (www.mittelmotor.de) The parts are a combination of parts from there 100L tank and a filler neck for a 62L tank, the 62L tank neck is drilled for our stock tank mounting flange. Ben
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1- Filler Neck 62L tank Part # 0,08220 Price 125.21 E
1- Support Ring Part # 0,08214 Price 7.56 E
1- Rubber Funnel Part # 0,08212 Price 34.45 E
1- Support Ring #2 Part # 0,08214 Price 7.56 E
1-110mm fuel cap Part # 0,08211 Price 131.09 E
1- Aluminum trim ring for hood Part # 0,08213 Price 25.21 E
I hope this info helps!