Rear caliper issue

What’s up guys. Just wondering if anyone knows about the following. I have a 1978 kz1000a2 with another year and model swing arm. I’m unsure of what year and or model the swing arm is off. I included a photo to help with identifying. My issue is im trying to convert the bulky caliper over to the same small calipers I’m running in the front. Much better look in my opinion. So far I can see the diameter of caliper bracket is way off. I’m assuming I would need a custom bushing made here???? Is there something that already exist for this conversion??? Will I also have issues with aligning the caliper to rotor??? I’m hoping someone has already done this and can weigh in with some insight and tips.

Forgot to attach photos

Looks like a 81-83 Suzuki GS1100E swingarm.

kzrider.com/forum/13-bike-related/612005...ating-my-z1000j-1983

No eBay APP ID and/or Cert ID defined in Kunena configurationScirocco is correct... That a GS1100E swingarm… I think this is the bushing you need...

If you click "insert" your photos will show up in high resolution instead of tiny thumbnails. I wish the forum would fix the software.

I also had someone tell more the rotor size would be different with the smaller caliper. Is this factual? If so...does anyone know the correct rotor size. Is the change in diameter of rotor or in thickness?

It was cheap enough so I just ordered and taking the chance. Thanks bro

Where is this “insert” you speak of. I only see attachments option. Can you take a screen shot of where you referring to possibly?

I checked all the rear rotors I have that us that LTD style caliper... and the are all 10 7/8"

I measured mine today. Looks roughly 11 1/4”. I’m thinking no good with your new info. 3/8” is a bitch!!!

I also checked this rear suspension I have that Is similar to yours and it also a 10 7/8” rotor

Look at this photo and see the insert tab under the photo. That’s how you nsert into body of text