Rocket Lanch

Hi Ya'll. So recently I was taken care of some small maintenance issues I've neglected to fix in the summer, but since it's winter and i'm not driving the car I have more free time to work on it; cause i'm not having so much fun driving it So I took off the tail lights to fix the bad gaskets, dried the tail lights out and cleaned everything up; and put the new gaskets on. Once putting the tail lights back in place and tightening up the nuts, a bolt on both tail lights snapped off. Is there any way to fix the broken bolts or would I have to buy brand new assemblies? I could only find one forum regarding this issue, but there was no clear answer on how to fix this. Any Help is much appreciated!