JD Jetting Mikuni TMX carburetor top gasket – late style NON-TPS models.  Picture shows all parts included. Part #JDMK08

For example some applications include:

2005-2019 Yamaha YZ125

2017-2019 KTM 125, 150, 250, 300

2017-2019 Husqvarna 125, 150, 250, 300

2001-2006 Suzuki RM125

2003-2005 Kawasaki KX125