S&S heads bolt size for throttle body mount ?

[aabikrman]

I'm hoping one of you can answer what should be a simple question.  What size bolt are S&S heads threaded for where the air cleaner/throttle body mounts (stock Harley heads would be the breather holes) ?  I'm changing a throttle body and I'm not real confident that the correct size bolts were used in the original install.  The bike is an '06 FLHX with 124" hotsetup kit installed.  Casting #'s are 90-1050 R-S. 

5/16x18 is what came out of both holes but the threads are a little rough in the heads and I don't have a 5/16x18 thread chaser on hand and need to go chase down what I need to finish the install.....

I called S&S but haven't heard back yet.

Thanks in advance....!