I usually buy them from AliExpress, but let me check the American Amazon (I'm in Canada).

Edit - Examples: https://www.amazon.com/dp/B09CFXPRY5

https://www.amazon.com/dp/B07RYFHM9Y (get the straight lever versions).

Depends what you want to use as a switch plate and rev trigger. I designed and replaced mine with custom ones for push button (leverless) switches.