Question about a lens board

I have a Pacemaker Speed Graphic camera that currently has a 135mm Graflex lens attached to it.

Recently, I bought a new lens via eBay that is a 210mm lens with a Copal 1 shutter on it.

Well, the lens board is just a smidgen too small for this new lens, so I must find another lens board for it.

My question is... What size opening should I be looking for?

Is there a list somewhere of the different lens board sizes for these Copal shutters?

Thanks,
Steve

Found it!

Sorry, found what I was looking for.

Steve