I found a great deal($15.50) for these Moose ATV handwarmers. They look similar in all ways to most Motorcycle Handwarmer kits. I doubt they have additional heating elements for the non-throttle side, but how important is that anyway?
Are there any good reasons not to buy and install on both my bikes. Any known issues with this specific model?
If you install them under the grips, heat shrink tubing over the left side of the handlebar first is a good idea. You can also install them over the grips and cover them with Grip Puppies. A heat troller or other variable controller is recommended in that case as the things are prone to overheating with only the puppies in the way but they need less power for the same heat output.