I don't have my car at arms length. Does anyone know if I should order the 5/8" hub or the 3/4" hub for 1st gen? It sounds like from reading the thread on 2nd Gen that some type of bushing or sleeve may be needed...I'm assuming to make the SAE to metric fitment. Or does anyone know where there are affordable metric "Sleeve-style" hub assemblies? I'm currently looking at RacerParts Wholesales $39.99 version (page 64 of new catalog)