I was going to switch my taillight bulbs to led's. I just assumed that the old bulbs were 3157's. The owner's manual does not give the bulb specs. I looked at one of the installed bulbs and it is a 7443 It looks similar to a 3157, but a 3157 will not go deep enough into the socket. The plug portion of the 7443 is at least 1/4" longer than a 3157.