I'm not sure on Kawasaki as I only have Hondas, but what I do is look on Partzilla and/or CMSNL.com then you can see exactly which other models use the same part (you have to be logged in to see more than 10 models - but it is easy and free to sign up). Use the OEM or replacement part number and do a google search. Another alternative is to go to your local chinese motorcycle part shop and see what is the closest fit from what they have available there. If all else fails, build your own part.
1983 Honda ATC250R
1983 Honda ATC200E BIG RED (sold)
1984 Honda ATC200E BIG RED
1984 Honda ATC200X (sold)
1985 Honda ATC70 x 3
1985 Honda ATC250ES BIG RED
1988 Honda ATC250ES BIG RED
1995 Honda Frankentrike 50cc 2-stroke
2001 Honda TRX90
2004 Honda TRX300EX (sold)
2008 Honda TRX250TM
1976 Suzuki RV90M (sold)
1967 Vespa Primavera 125
1958 Massey Ferguson 35