Well, it is kind of a trial and error process.

You need to find a brake lever that has a 1" handlebar (cruiser) and the same size master cylinder bore and runs a single piston caliper if you want to keep things the same.  If you get a different size or different leverage ratio lever....the brake feel will change.

For the clutch you again need a 1" diameter handlebar, and a somewhat long clutch throw.

I changed my handlebars to 7/8" and I initially used a clutch lever from a Honda motocross bike - and discovered the clutch lever did not provide enough cable pull and it would not disengage the clutch entirely.  I ended up using a 2001 GSXR 600 clutch lever.

For my front brake cylinder I used a Honda TRX 400ex master cylinder.  This was designed for 2 front brake cylinders on a quad.....and the lever pull ended up taking a bit more strength I believe.

Not sure about changing just the levers.

When I wanted to do that I took my lever off and went to a local repair shop that is not a dealer.  They have a whole wall full of levers and I just kept looking at levers through the clear plastic covers until I found one that worked.

I realize this was posted 5 years ago... has anyone been able to find something or know of a company that makes them now??