It turns out that the channel for the Lithonia turret industrial in nearly identical to that used on the regular industrial. The only difference in the channel itself is the length (49-13/16 vs. 48), in order to accommodate the spring-loaded lamp holders.
Also, the socket mounting plates are different. The turret unit obviously holds the turret housing, while the regular can accept either ordinary bipin twist sockets or RDC/slimline (by flipping it around).
As far as I can tell, Lithonia no longer makes a non-turret fitting with the large channel anymore. I believe this was some variant of their EJ series, and while the EJS appears to be identical, the dimensions are smaller. Lithonia is using and outdated photo from the looks of it. In fact, it still shows it with T12 lamps even though T12 is no longer an option