I bought my first set from Superbrightleds. They sent the wrong led's the first time. The second set would not fit the sockets. I returned them for a complete refund. I went with Ledtronics next. Easy to install. I suggest you do one bulb at a time. Carefully pull the first one out, observe how the contacts are positioned. Install your first LED in the same fashion. Verify you have both running lights and brake lights before attempting the second. If it does not light, carefully remove and reverse position 180 degress. Mine went without a hitch. Hope this helps.