The black items indicated by the arrows in the pic are sockets removable by a 1/4 CC turn as noted by doofus. The replacement bulbs just plug in. I just did this change out with stock 194's. I have a '97 and if they lasted this long, I will never have to replace them again. FWIW, I would change out all 5 and be done with it. Doofus did a great job on this.