Search using PN 92055-0892 for the 15.8mm x 20.6mm x 2.4mm O-ring or just switch to 93125K43 which have a temp range of -40° to 250 F which are the ones Kawasaki used for years. These are $13.77 per pack of 100. vs the $4.99 each that I have seen for Kawasaki ones online but of course I pay a lot less even for those from my distributor.
or you try 9464K27 which are 5/8 x 13/16 x 3/32 which are rate for to 400 F. These will be a slightly tighter fit. These are $10.70 per pack of 50
Both of the alternates are from McMaster-Carr.