Try a Galls catalog or anywhere that sells ems equipment.
DO they have replacement " hid" for stock bulbsI have yellow strobes on the front & rear to match my bike, they work great & they are completely sealed. <a href="http://www.pmlights.com/products.cfm" target="_blank">http://www.pmlights.com/products.cfm</a> I have the 153s lights.