That very much look like a L model air filter.................
I strongly suspect that Kawasaki dealers will sell you one......................or buy a cheap pattern one from any of the online pattern parts websites
11013-1216 is the complete unit
and 110-1209 is the filter element
And after looking it is definatly L model
You know you could save yourself a lot of time just by looking up the microfiche on ZXRworld yourself
http://www.zxrworld.co.uk/zxr400/micro.html