Here's some pics of the Ludwig Dealer binder I got when I worked at a local music store in the 1990's.
At that point we didn't even carry Ludwig anymore, but we had a drawer with tons of modular brackets, arms, and wrenches. I was in highschool and would clean up the shop for miscellaneous parts for my clubdate set.
Eventually they hired me for the summer. $4.25 an hour!
If the vintage drum guide would like this to post let me know.