running light relay ?????

im changing my running light relay cause my taillights are not on, so i got two diferent relays today, but then i realized that the smaller clip of the two on the relays has three prongs, and the wiring clip has four, so i need to know what model has a four prong relay, im assuming its the si cause i have the si harness in my civic, but i would just like to find out for sure so i dont have to keep looking for relays until i find the four prong one???