z1 brake upgrade ?

i was browsing feebay when i noticed an insanely overpriced kz for sale ,imagine that!:laugh: anyway what caught my attention was the front brakes on the bike.says theyre off a gs1150 suzuki when i looked for gs1150 brake parts the same rotors came up. ;)the suzuki picture shows them as having 6 holes like z1 rotors but this guy seems to have modified for 4 bolts.