Got in the 3rd version of the Bally/Stern boards today. Whipped one up real quick to do an assembly verification. Here's a pair of photos to show the updates.
This shows the whole sets, I kinda mixed them up a bit, whoops. Anyway. You can see all the board sizes were tightened up a bit by eliminating the extra holes originally used for bottom entry connectors. The boards on the right side are the 23 pin adapters, which were having the issue with fit in some machines.
The re-arranged layout, and smaller board size, are shown better here. I mounted them both onto a header to measure the amount of change, and it moves that troublesome left edge over 0.6 inches. This should keep it within the outer dimensions of the lamp driver boards. With the male header moved over it should also be easier to plug the wire connector in. Not as easy to see is that I'm also moving to longer pins on the headers as per feedback I've received on the connector sizing.
I do have 4 sets left of the old style, and I'll be shipping those before starting to ship the new. But if you have a machine with clearance issues just let me know and I can make sure you get the latest revision. Other than the dimensional changes the two revisions are electrically identical.