Pulling a steering wheel

Guys - I'm in the process of removing the steering wheel to replace my turn switch.  Used air impact to remove the center nut and now going through my puller bolts to find the right size.  I can get a 5/16ths into the holes but threads only so far.  Thinking it's probably metric, right?  I don't want to wrench down the wrong size, tearing up threads.  Gary's great info on the tech pages (fac'tree manual) doesn't say what size to use, so I'm appealing to maybe someone whose been there.
I admit to being an SAE guy in a metric world.  :-(

M8x1.25, just did this myself a few weeks ago.

Thanks a bunch!!  

Sure thing. Good luck dude!

Which switch are you installing? I need to do this too.

Juan - I'll post about it when it comes, fits & works correctly!  Stay tuned!

Hi Tom, any updates?