Seat Belts and roll bars

My CJ has an aftermarket roll bar on it. When the roll bar was installed,
the installer drilled a few holes and used a standard bolt and nut to hold
the seat belt bracket to it. Not to industry standards, I'm sure. I have
been looking for the proper swivel type connection and bolts and, so far, I
have not found them. All I can find are the replacment belts and I do not
need any of those.

Thanks,

Chip