Firstly having the proper rated bulbs does matter, for two reasons. One, the 250 will be hotter inside its casing and thats not good and second more cuurent drawn.
After you take off the outer case you will see where each lamp is within its casing. Simply and carefully remove the tiny screws that hold the lamps in place. You will see this quite easily by looking at the back side of the tuning lights with the front of the unit facing away from you and the back of the unit nearest to you looking in. They are quite easy to replace just like a fuse, they are called fuse lamps after all. If you look at the insides it really does explain itself how easlily they come out and go back in.
Cheers
After you take off the outer case you will see where each lamp is within its casing. Simply and carefully remove the tiny screws that hold the lamps in place. You will see this quite easily by looking at the back side of the tuning lights with the front of the unit facing away from you and the back of the unit nearest to you looking in. They are quite easy to replace just like a fuse, they are called fuse lamps after all. If you look at the insides it really does explain itself how easlily they come out and go back in.
Cheers