The 6 page (8-1/2" X 11") Simplex catalog for 1960 detailed the Simplex
standard features:
Chassis, Bumpers, Slotted motor mounts, Brakes, Steering, Axles and Wheel flanges.
The catalog also included complete specs on live and fixed axle models as well as two full pages of optional equipment to suit individual preferences. Here's a look at the live axle model:
(sorry for the image quality on this one)