Segments TEKNIX Ø39X2mm for kit 50cc origin or adaptable on MOTOBECANE av7

Here is the segment sold individually, diameter Ø39mm by 2mm thick, standard steel model not chrome. For mopeds, mopeds old models MBK 40, 50, 88, 89 ... Motobecane AV7, on cylinder origin or original type 50cc.