I have been looking at adding LED lights to my exterior, tail lights, side markers, and front turn signals. I have been looking at replacement bulbs only with the understanding I'd need to get a new flasher unit. The site is... http://www.superbrightleds.com/cat/led-vehicle-replacement-bulbs/vehicle/1975-pontiac-firebird--/48-532--/ What I'm wondering, and I'll call the place but was looking to hear what others have to say as well, is do I just buy one bulb and it will replace the multifunctional bulb already there? I have also looked at RestoreAMuscleCar and FbodyWarehouse products.