The ML7-R was non Power Cross feed, and fitted with a 4 T-Slot Cross Slide as standard (Together with the ML-7 style of compound/topslide), with a longer 5 Slot version available as an accessory.
The Super 7, both non and power cross feed, was fitted with a longer 5 slot cross slide as standard.
Also on the Myford Ltd website, the excerpts from the Super 7 Power Cross feed model manual, on the Carriage Assembly spares page, shows the 5 slot cross slide as standard, so sort of shooting themselves in both feet!