From the list at IBMWR.org, with a few annotations from me (wmax351).
Yamaha/Kawasaki shims for 2-valve K shims
Date: Tue, 18 Nov 1997 11:04:23 -0700 (MST)
From: Tony Black <TBLACK@cc.colorado.edu>
One item did come up I want to let owners know about. If you need a shim for your 2 valve K and you don't have a dealer close by, shims from some models of Yamahas and Kawasakis will fit in the Ks. If you have one of these dealers closer I'd use them. I have many times on my bikes and others. Ciao Tony