https://es.aliexpress.com/store/product/For-SUZUKI-GSX-S750-GSXS750-GSXS-750-2015-2017-Motorcycle-Accessories-Oil-Filler-Cover-Screw-Plug/1971828_32907452625.html?spm=a219c.search0104.3.9.50ac2fadAr4MN7&ws_ab_test=searchweb0_0,searchweb201602_4_10065_10068_10547_319_10891_317_10548_10696_453_10084_454_10083_433_10618_431_10307_10820_10301_10821_10303_537_536_10902_10059_10884_10887_100031_321_322_10103,searchweb201603_6,ppcSwitch_0&algo_expid=6f6d4632-07a2-4780-a34d-9134ffa41070-1&algo_pvid=6f6d4632-07a2-4780-a34d-9134ffa41070
https://es.aliexpress.com/store/product/NICECNC-Oil-Filler-Cap-Plug-For-Suzuki-GSXR-GSXS-750-1000-V-STROM-650-Bandit-1200/1334146_32887355717.html?spm=a219c.search0104.3.32.50ac2fadAr4MN7&ws_ab_test=searchweb0_0,searchweb201602_4_10065_10068_10547_319_10891_317_10548_10696_453_10084_454_10083_433_10618_431_10307_10820_10301_10821_10303_537_536_10902_10059_10884_10887_100031_321_322_10103,searchweb201603_6,ppcSwitch_0&algo_expid=6f6d4632-07a2-4780-a34d-9134ffa41070-4&algo_pvid=6f6d4632-07a2-4780-a34d-9134ffa41070
Aquí te dejo un par de ejemplos, aunque la medida del tornillo no la dice.