Those Suzuki seals are probably exactly the same as the Kawasaki seals. Manufacturers use outside vendors for such parts. When I recently rebuilt the brakes on my ZRX, I used Suzuki Hyabusa seals. They are exactly the same seals used by Kawasaki, made by the very same company, but fromSuzuki they are about 1/4 the price.
Never the less, Viton seals are better.
1982 KZ1000 LTD parts donor
1981 KZ1000 LTD awaiting resurrection
2000 ZRX1100 not ridden enough
When I had my head redone I went with Ape seals since they did the work......... at the time I didn't read much about whats better and might have went with the viton ones if I had done so but am not worried as the Ape seals are said to be proven to be top quality.
1978 KZ650 b-2
700cc Wiseco kit 10 to 1.
1980 KZ750 cam, ape springs, stock clutch/ Barnett springs.
Vance and Hines Header w/ comp baffle and Ape pods, Dyna S and green coils, copper wires.
29MM smooth bores W/ 17.5 pilots, 0-6s and 117.5 main
16/42 gearing X ring chain and alum rear JT sprocket....