Suzuki genuine piston bare without rings , I believe for TS/TS125ER DS RV 125 ?? and plus 1mm oversize , I do not have the original packaging or part number so I am not 100 per cent

Diameter 57mm, Height from lowest part of skirt to edge of crown 62mm, Piston pin size 14mm

Please study the dimensions and photos to be sure this is what you require 

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