Ok, so I'm new to the whole jerry-rigging stuff.
I have a soundbar with a roughly 7in-3in cutout for the domelight. This light is all busted up and I just got it working again today. I found a really nice one on superbrightleds.com that is 5 3/4in-2 3/4 inch. I need to make something to size down that gap for the domelight. It also needs to be pretty tightly sealed because of the speakers being in there. I have some leftover dynamat lying around, so that will help when it comes to sealing.
I attached a picture of my current dome light, the cutout, and the new dome light's measurements.