Rotor size, need help

I have a set of blue mags on a 1979 kz 1000 bike i bought but do not think they are off a 1000 for a few reasons. I took the brake calipers off the bike and when i took the pads out i noticed only half of the pad was being worn. So either its the wrong brakes or rotors but when i compared the rotor size to another 1000 i had they were smaller. The disk size on the 79 1000 with blue mags are about 10 inches in diameter and have a 7 allen head bolt holding the disk on with a inner diameter of about 5 inches. Can any one tell me what wheel on what model comes standard with dual disks with the rotor size i described with the 7 bolt pattern?

It should look close to this one.

Those are 1000 rotors. I just figured out with a good friend of mine who is into the kz's too and they are gpz wheels. I just need to know what size and year it is to compare so i can get the appropriate brakes for it. I hope someone on here has a gpz they can compare rotor sizes too.

GPz750 rotors are 10", GPz1100 rotors are larger, but I don't remember how much larger.

GPz 1100 B1/B2 front rotors are 270 mm/10.629", UniTrak rotors are 260 mm/10.236" - both are 5 mm thick with a 4 mm service limit.