I think they are 14x22.3 but other sizes might work okay. https://www.amazon.com/dp/B00K3B595M/ref=cm_sw_r_cp_api_PxEVybFFTKRX2

I actually just watched the oil change video from Jake TheGardenSnake where he links the crush washers he used for his 2016 FZ07. Thanks for the help!

Video: https://www.youtube.com/watch?v=wwAQx7WCObM

Crush Washers: https://www.amazon.com/gp/product/B00K3B595M/ref=as_li_ss_tl?ie=UTF8&psc=1&linkCode=sl1&tag=jakesnake-20&linkId=c4a1fcd63fb9b300320c5cad4b0c189c