I want to upgrade all my flashing lights (turn signals, brake lights, reverse lights, and daytime running lamps) to LED's. I did not want to deal with the headache of putting load resistors in line for each light so I picked up a replacement Flasher Module. GM#: 12450072 (original flasher module) Aftermarket: EP29L (LED compatible flasher module) Box and un boxing: Pins: Comparing the GM to the Aftermarket module: Locating the flasher module: The socket for the flasher module is a tight fit and the LED compatible module has little spikes on the sides of the spades that go into the socket; such that the new module does not sit all the way in the socket. Even with the new module not plugged in that extra 2mm, it is in the socket tight and will not move. I have yet to order my LED bulbs for my turn signals, brake lights and reverse lamps. Once I do and install them I will update this to verify that I do not have any "hyperflash" with the switchback LED's.