Originally Posted by jmc0319
The two long bolts are actually coming through the top of the plastic box.
You might have to get creative with this one - do you have access to the top of the box?
I take it you need this box to present female screw threads, 6-32 or 8-32 or 8-24, with a certain on-center spacing and maybe these two need to be oriented in a certain way with respect to the walls.
If you do it with threaded spacers,
to make room you may need to lower the fixture slightly with a thick, fire-resistant medallion or escutcheon plate.
Or you could make or buy two of these
and epoxy the holders to a nearby surface.
And sometimes these
come in handy.
It's not like you'll be replacing this every month.