Seems I found the types for your clutch. Doublecheck sizes in the Aliexpress links, at least you can see Kawas that look like containing yout type of clutch. Sets of friction plates are all around € 30.- or so.
Vic
Vic
18.27US $ 35% OFF|LOPOR 8 Pcs Motorcycle Fibrous Clutch Discs Plates For HONDA CB750 CB900 CB1100 VF1100 C,F,K,SC KAWASAKI KZ1000| | - AliExpress
Smarter Shopping, Better Living! Aliexpress.com
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19.04US $ 35% OFF|LOPOR 7 Pcs Motorcycle Fibrous Clutch Discs Plates For KAWASAKI ZR850 Zephyr ZR 850 1984 1985| | - AliExpress
Smarter Shopping, Better Living! Aliexpress.com
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26.39US $ 20% OFF|Motorcycle Friction Disc Clutch Plate Kit For Kawasaki Z650 Z650B GPZ750 Z750 GT ZX750 Z750E KZ750 KZ750E KZ750P KZ750H KZ650| | - AliExpress
Smarter Shopping, Better Living! Aliexpress.com
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20.3US $ 30% OFF|7PC Motorcycle Friction Clutch Disc Plates For Kawasaki KZ650 CSR Custom ZN700 LTD KZ750 Spectre 750 Sports ZX750 GPZ750 77 85| | - AliExpress
Smarter Shopping, Better Living! Aliexpress.com
www.aliexpress.com