Need to know which olive and insert I need for my shimano saint m810 brakes as eBay and Google throwing up different answers.

It depends on the hose rather than the brake. Bh 59 is for the older hose and Bh 90 for the newer thinner bore. In practice I’ve mixed and matched without any problems but if in doubt go for the Bh 59.

Cheers pal I did think that as some say the m810 have the high pressure hoses and the newer olives are needed but then some say only the m800 use the old olives…. Mental