um, first off... how much do you want for that car!?!? that is sooo nice!! what spoiler is that on there??
Autozone and other car parts stores have a "variable rate" flasher... the only down-fall to it is that its a mechanical flasher, so they tend to be a little loud compared to the electronic flashers found in most honda cars.
A variable rate flasher can be made, using the stock flasher... but it does not work well with LED's... the LED's draw so little current, it makes the flasher "think" there is a bulb out... being that the flasher in your car has a "system" that makes the bulbs flash fast when a bulb is out, even if you vary the rate of flash, it still does not flash as it should. The speed may seem right... but the "on-time" of the signals is not what it should be.
If you go to a store that sells the LED Truck lights... they SHOULD have a flasher that is made for LED lights... some of them are expensive though, like $50... but they work nice.