It's easy enough to put a new 5 mm led on to replace the broken one. All you need to know is how to solder a connection to an led. You'll also need the correct resistor which by the looks of that picture above is already attached.
His problem is not the new led. He has to take the front of the car apart. I will send him a few pictures soon, so he can do it by himself!
I will buy the second one then. Nothing to do with 4.5v? The manual specifically mentions 4.5v though.
Yes, 4.5v. I meant the polarity!