I have one on my '95. They are very high quality and work well. They come in two sizes, one about stock size and the other a little longer. They are made of stainless steel. I have the regular one but you can get the polished version for a little more. The polished one looks like crome. Most Kawasaki's come with solid bar ends. If the '03 have solid bar ends then the model that fits the '00-'02 should work.
Why would you want cruise control on your bike? It'd be a good thing on long trips but much easier to load your bike on a truck and take it with you and then when you get there, ride. If you ask me cruise control works but for cars and besides it makes people lazy. But I am not expert but when I am out on the road I like to have my 6 senses in tune with my bike.
I have seen two different cruise control units for the 03 636 one was around $25 and the other was like $21. A buddy of mine bought one for his busa. He only puts it on the bike before long trips. He loves it though. says it works great.
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