Are these new, don't remember seeing before. -- https://www.ebay.com/itm/YAMAHA-RD125-RD200-RD250-GAS-FUEL-PETROL-TANK-CAFE-RACER-SCRAMBLER-BRAT-GT/233698374631?_trksid=p2485497.m4902.l9144
Have seen similar to these but not this particular one, or any from Italy. -- https://www.ebay.com/itm/Fuel-Tank-Tank-Fuel-Yamaha-Rd-350-73-76-COD-212-A/352570547419?_trksid=p2485497.m4902.l9144
chinese universal tanks. they are not bolt on by any stretch.
The first link says there is lead time for them to make mounts. " Comes with tailor made mounting pegs and brackets (fabrication normally takes 15 days to complete)"