We purchased used Graham drives years ago and have run on two different planters, both Deere finger and Vset meters.   The ones we have mount outside the box support plate on XP or earlier style units, so nothing is different inside the unit except the chains and shafts are gone.  With Graham, you can choose between multiple control monitors, including Deere Seedstar or PP 2020.

Have been very impressed how well they have worked with minimal issues, have seldom needed to call for support for anything.  The biggest issue I can think of is when we used radial bean meters, they would often jam and blow fuses in the power harness.