Ok so if you are so set on getting another bulb, this is the easiest thing to look for. Sylvania #2721 get 2 for like 2bucks. Go to autozone, pepboys, or where every you can get a good selection of automotive bulbs. These are clear bulbs but i'm not sure if the stock bulbs are actually green or have a green cover over them. Mine were clear w/ a green diffuser until I put in led's. Or if the stock bulb is actually green, you could tape some green celophane over the diffuser lense on the back side of the handle surround to get the green.
