replacing bathroom light

I'm replacing the light in my bathroom. When I removed the old light I saw that the octagonal junction box is not flush with the bottom edge of the ceiling drywall. This means that I can't securely attach the new light, since the screws will have to remain loose to bridge the 5/8" gap.

Do they make j-box extenders to solve this problem (easy solution), or should I go up in the attic and remount the j-box so it is flush (not as easy)?

Also, the new fixture requires 90 degree wire. I assume this means that all wires in the j-box must be 90 degree, which is no problem since I can pull a new wire from the upstream j-box. I don't have to replace the wire all the way back to the panel, right?

Thanks,
Matt

 

They do make jbox extenders. You can replace only the last 1 foot of wire if you want. Just install a new box a foot away from the old one and use new nm-b 90 degree rated wire.