My car was converted to 5-lug discs all the way around before I bought it. Is the 94-95 spindle the only way to convert to a 5-lug disc? I'm looking into going with a 13" Cobra set up but I'm not sure if I need to start looking for a set of spindle too. Is there an easy way to tell the difference between spindles, visual cues, casting numbers, etc.?