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Hi,

I purchased mounting hardware 5/16 -18 x 1" (someone recommened this on this forum).

The bolts seem too small for the holes on the STB and the holes on the firewall (I had a previous STB; which was stolen).

Can someone please confirm the hardware specs for this strut tower brace?

Thanks in advance.
 

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I installed mine I used 5/16 -18 X 1 inch with washers.
 

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I would just measure the holes on your STB and buy hardware to match and drill the holes already in your car for the old STB larger to match. I wouldn't assume it is any larger than 3/8", but it's possible.
 
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