the #89's Pete?
I put some cointaker red and blue 89 flashers in my Firepower. They are certainly bright and vibrant.
However, I reckon you can tell a difference between the original incandescents and the LEDs because the LED flash has a shorter duration. I speculate that the incandescent flash lingers longer as the filament cools.
You may also find that you need to make a small circuit modification if replacing incandescents with LEDs. Excuse my poor ascii art below, but you need to take the resistor between the lamp and ground out of the circuit when you swap the lamp to a LED.
solenoid drive --------/\/\/\---------(LAMP)----- +ve
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---/\/\/\------ ground
