I've searched and only found one post with an opinion and need more of them.
Which are better: the spacers with there own wheel studs or the straight through design? I will only need 10mm or so.
thanks

 

You won't be able to find one with studs that's 10mm. They really need to be about an inch or so to work properly, as they need to cover the existing studs and nuts, as well as have sufficient material to properly locate the new studs.

A 7/16" (~11mm) spacer from Summit Racing or other places will do just fine. You'll need longer studs. ARP ones for Corvettes fit, use the longer ones in front, shorter in the rear and you'll end up with ~1" longer all around.

 

Wheel spacers with studs start at 15mm. At least the ones from Mackin Industries (Volk, etc).

http://www.mackinindustries.com/wm/kics/kics.html