the metal ones with the grey shanks (pictured) that i am selling on ebay are 100% correct for UK model z1,z1a,z1b.and z900 these are No longer available
The later uk z1000 metal ones had a black shank but were still a simular shape with a larger end rubber, these are still available from kawasaki.
And the the yankee bikes had all black non-metal ones that had the 2 outer ones angled slightly and the inner ones were straight.
beware A lot of the metal ones currently being sold cheap on ebay are intended for snow cats and chain saws!!!!
hope that helps!