1) Need TXDWorkshop tool or any tool can open .txd files
2) Open particle.txd with TXDWorkshop (located in your gta san andreas/models folder)
3) replace "coronaheadlightline" with this "coronaheadlightline" downloaded
4) replace "coronastar" with this "coronastar" downloaded
5) replace "shad_exp" with this "shad_exp" downloaded