Trying to get an answer here:

I have 8mm wheel spacer on hand from a previous car. They do fit the wheel pattern but nuts only have 2.5-3 threads engagement then. What I want to do is change my wheel studs to fit the 8mm spacers. I tried to find info on the web but what I found is incomplete and contradictory. Sometime list as 1/2-20 other time 12mmX1.5. Stud lenght and knurl diameter are never revealed...

Do someone have the complete wheel studs specification for the 2013 SHO with performance package? Thanks a lot!

(I know, I shoud dissemble one or buy a new one and measure it myself but I am pretty sure someone knows)

Sorry.  I don't know.  But I would like to know how you make out with it.  8mm is 5/16"   That would make your track 5/8" inch wider.  Very subtle but I think it might add to the over all appearance and handling.  Good luck and be sure to let us know how it comes out.  Are you going to do front and back?  Is our track a little wider in front?

Have you considered calling TireRack, or looking on Rock Auto's website?

there 1/2 20 on my 2011

I am doing spacers mainly for apperance. I want to do the job at the same time I install Eibach springs. I find lowered cars increase the gap between wheel and fender because they're closer.

I might try tirerack. Thanks for the tip!

Good luck on the project!  Don't forget the before and after pictures.  (Close ups too)  I have the Eibachs too and am really interested to see how this works out.

I looked up the 2010-2013.  Front track is 65.3, Rear is 65.5

Are those measures the distance between wheels in inches or the lenght of the studs in mm?


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That is the track I believe it is measured from wheel center to center. 

I would think a dealer would be able to tell you or get the info you need from Ford. I feel your frustration but I don't think it is common knowledge. 

Project not dead but still no advancement. I went to car quest, Napa, tuning shop and local tire and wheel specialist. No one was able to find any infos on those wheel studs. But! My wife's cousin work for a Ford dealer and I asked him if he could help. Hopefully they are in stock because dealers only have parts number link to VIN without specs... This is my last chance before I dissemble one and measure it myself.

Finally! Long story short:

Wife's cousin order an hub assembly as it wasn't in stock. Got back ordered then was delivered during his vacation. This morning, he had some spare time so he dissemble one stud from the hub assembly, measure it and took pictures:

1/2-20 RH 60mm long, 30 grooves on the knurl, all the same 20 studs for the 4 corners







Now I need to find longer aftermarket studs that fit with my 8mm spacers.

Nice find, now that is dedication.

I found some that are 2.875 inches long.  Partstrain.com

Thanks Jay!


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No problem.  Let us know how you made out.  I have eibachs too but have not installed them.  I am going with 1/2" spacers.