Could someone please recomend a source of either NOS or good replica fenders for my YZ 125 A thanks Bill.
try mainly maico
I think there is a white Yamaha one the right shape - you'll have to spray silver with red/black decal I think. There's other suppliers - all offering the same DC plastics fender probably.
But if you want NOS 'ready to go', try ebay.
Adam of Wilton (YZ360 here I think) might have one. PM him.
Good luck.