how do I find the offset of the factory steel/plastic cover wheels that came on my Accord Lx 04 4cyl. I am looking at upgrading to factory alloys and want a proper match. I have seen other tires advertised as being the proper wheel for the car, most are 16x6.5 but the offset seems to vary per set. I have seen 45, 55 and I think a 65. cant find the info in the manual.