Yup, that method of measuring should work. Or use the 50' viewing angle method as described on Clearview's site for a check.
Western Powersports is our dealer in Langley. Been dealing with them since 2006 and they have been exceptional. But we just bought the Triumph. We have a Yamaha as well.
If you're not going to use your bike until spring, you might want to wait until later on to order the shield. Clearview only puts a 6 month warranty on their product.
"Clearview Shields covers all windshield products against defects in the material or workmanship for 6 months from the date of shipment by the original consumer purchaser."
H.