Ad Astra Observatory

I’m planning to use L-brackets to attach a Losmandy DC11 mounting rail to Trixie.

I need to figure out:
– how far apart are the holes on a DC11?
– what size bolts are normally used, so that I can get some of approriate size?

I was going to use a DUP, but the DC11 is a little longer than a DUP, and that will help with getting the scope to balance.