hi i've just bought a used car can someone tell me the windows are etched and i can't seem to understand what it represents i.e it's not the vin number or the reg number has anyone any ideas what else it could represent and do these models usually come etched when you buy them newor do you think someone could of had this etched whilst they've owned it .....also the os wishbone (i think that's what it's called has 2 bolts on it...but the ns seems to look different and doesn't have 2 bolts on it (hope that makes sense!) should they both look the same?