You can't suggest a belt length unless you also tell folks the gears used!
Going up even one tooth on either can make this not fit.
Better to note the CtC (Center to Center) distance for this mount, and then have folks go to bbman belt length calculator to get a calculated belt length estimate (has been pretty accurate for me). Now if you are using an idler gear or something - all bets are off and you just need to have a few alternate belt lengths to find the one that fits.
Just want to make sure people don't blindly order belts they cannot use since they don't have the same gearing setup!