Backrest

I have a 1980 KZ750 LTD. My girl wants a backrest when she rides on back. I had a luggage rack/backrest combo that recently broke off. Luckly, she wan't with me at the time. It appears the vibration was too much and the tubing snapped.

Anyone know of a quality backrest option that doesn't involve a huge amount of modification? I saw Corbin has a decent looking option but I didn't know if I need a Corbin seat also.

Thanks,

The Corbin backrest they offered me when I had my seat built by them is plugged into the seat itself.
And only if you ask them to prep your seat for the future fitting of the backrest.
Dave