What is the Bolt Thread Size for BH Foot Pegs/Boards?

[The Mindless Philosopher]

Does anyone know the bolt thread size used on early 2000's Boss Hoss front foot pegs/boards? I can figure it out with a bit of effort via a trip to the parts store, but I was wondering if anyone knew off the top of their head?

1/4-20? 5/16-16? Something different? Are they Metric? I've discovered my 2001 BH is a mix of Standard/Imperial and Metric.

I would like to install some angled arms that will push the main foot pegs a little further forward, but I will need different length bolts to attach them. I don't know the thread size.

As it is, I have Kuryakyn Swing Wings in place of the stock spades, but they are still not far enough forward when swung out even with the chrome bar slid as far forward as it will go on the lower frame.

I feel like a martial artist trying to do the splits when I use those pegs. Not very comfy. Meanwhile, I ride almost exclusively on the highway pegs I've mounted on the highway bar/crash bar (or whatever you choose to call it).