86 Venture 
Ordering new tires, Dunlop Elite 3, I know I need: Front: 120/90-18, Rear: 140/90-16 
Dunlop charts show numbers I am not familar with,  Front MR90-18 and Rear MU90B16, some shops show the "B" in the rear tire, some do not. 
Before I break open the wallet, does all this look right?? Thanks as usual!!