its not a 7443, someone else had this issue too, forgot the blb number. but autozone, pepboys, or where ever should be able to locate it, it may be in your owners manual as well, some of them have bulb charts. if not, look up the section titled bulbs, replacing in the index, it may be in that text as well. i also think advance has a website,
www.advanceautoparts.com, that may have it as well.