Personally I'd stay away from the piaa 1100s. I had them on my Goldwing , they are great but fairly pricey and if you use them daily as a means for conspicuity you will go through a set of bulbs a year and they are not cheap. I looked at Clearwater lights but they are extremely expensive. I have no doubt that they are a quality item, but costly. I opted for Rigid Industries Dually 2's. They are not inexpensive but alot less than the Clearwaters and are brighter.
As to the brackets I bought mine from the Kawasaki Authority folks. Pricey brackets but given the slim choices out there I bit the bullet.
Dave