Small carriage bolts of a satisfatory length can be purchased at home depot.
Originals are silver, but people paint them black.
Take some drill bits in hand, to figure the size, and sort out the width and length you need.
The hole I drilled was 3/16", so maybe a 10-24 bolt?
If you mount the DMD panel all you have to do is make sure the light board can pass over it when it swings.
And the lamps, or wood blocks on them dont hit the backglass.
Most of them pass over the DMD by 1/4" to 3/8" of clearance. More is a little better.
I beleive I posted some rough measurements earlier.
If the light board is too high, its never a problem unless its so High the key at the top hits it. Washers are on the hinge post for adjustments.
If it to far in, its also never a problem, the hinges are slotted to give you adjustment.