Bob,
There are 2 companies who make the white walls for our bikes. Maxxis & Dunlop. You can get the rear tire in the exact size as the stock tire on your bike, however the front tire comes a little larger (120/90/18). The Maxxis tires are a little cheaper with a wider white wall. Although with the Dunlop you will get more miles out of them before you have to replace them. I've used both and both are good tires. Just remember you will need to modify your fron fender bracket. The larger front tire expands at highway speeds and will rube against the bracket so you need to raise it or cut the middle section from the bracket.
"It's a hundred and six miles to Chicago, we've got a full tank of gas, half a pack of cigarettes, it's dark, and we're wearing sunglasses."
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Ride safe.