I am looking for new rotors for my 86 Alfa Spider. My wheels look to have a 4-bolt pattern. I see replacement rotors on EBay for a Spider but they appear to have a 5-bolt pattern. It could be that the picture on EBay is generally used by the vendor and is not of the exact part, which is represented to fit an 86 Spider. I assume that if my wheels are 4-bolt the rotors much be too - correct?