Moving Light Flashes

Hello, so for many cars, mostly police ones, i like to import different parts for a bit more realism. For example, importing lightbars for said police configs. I know how to move the actual lightbar and everyting, but the textures for flashing dont move with the flexbodies, and i cant seem to find any co-ordinates for the flashers. I was hoping someone would know either how to move them or if im better using blender with a Jbeam plugin. Reference is below as to what i mean. Thanks!. (By "Flashers", i mean what i have circled in blue)