Rear Disk help

[dardoonk]

Can anyone tell me if I will be able to find a 220mm rear brake disc that will bolt to my stock wheel. I have a 77 GS750.
I want to fit a caliper from a 04 GSXR

[sharpy]

disc

Are you sure the four pot GSXR caliper will fit? Ill be checking the clearance between the rear of the caliper and the rim/spokes when u get the disc u want.

[dardoonk]

By just sliding it over the stock disc, I have enough clearance if I turn it opposite how it fit on the GSXR. Since it's non-direction, that's not a problem, but I have to check it with a smaller disk. Actually, its a pretty close call if the brake will function using the larger disk. I have full coverage of the pads without the disk hitting the edge of the caliper, but very little room for error.

Neither mounting bracket will work, so I'll fabricate a new one after deciding what disk I will use