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There are many aftermarket plug-n-play modules that will do this.
There is a line of Custom Dynamics modules and LED lights...that is what I have and I like. Very bright, four flashes then steady.
Kuryakyn also makes a decent module as well. That is what my son has on his '04 LR, with Custom Dynamics LEDs and he likes it a lot. His flashes more and faster than mine but is not quiet as bright.
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