Because all my bulb are dead I need to replace them with new.I know that there have several US markets that sell them,but I'm from Europe and the price including the delivery is too expensive.
I found in aussiearcade forum a member that alrady made mod with standard 5mm RED Leds.
The only question is how to understand wich of both wires is the positive one where it need to be put the resistor.
Here is the instructions of the mod which is very simple.