Excerpt from previous page.
American Racing introduced the Torq-Thrust "Original", also called the TTO, in April of 2004. The TTO wheels have several changes compared to the ones from the 1960s. The new product announcement on page 26 of the June, 2004 issue of Street Rodder says that "Instead of reissuing the disc-brake-unfriendly design, American Racing retro-engineered the original design and re-released it under the TTO (Torq-Thrust Original) banner."
The first visual difference that you may notice is that the holes for the lug nut washers are recessed more than the company's early wheels were, like they were recessed on the old Appliance wheels as well as the way they are on American Racing's other current wheels.
Also, the wheel pictured in the ad for them on page 22 of the same magazine shows that the cast-in recess that is found between the inner-most area of the machined lip and the outside edges of the spokes on the original aluminum Torq-Thrust and Torq-Thrust D has been eliminated.
A further difference is that the center cap is American's late-style cap, which has a larger bolt circle than the original wheels that American made. This was done to allow the center holes to be larger, to fit later-model cars.
In June of 2004, American Racing sent me the following message. Quote:
"The Torq-Thrust Original (part number AR309), like all of our later-generation vintage wheels, uses a conically-seated lug fastener, not a mag shank with washer. The TTO is a one-piece, low-pressure casting of aluminum alloy, which is heat-treated. The original Torq-Thrust wheel featured backspacing of 3.5", while the new TTO offers a backspacing of 3.75". By using a .75" head lug nut with a thin-wall socket, there is no contact or clearance problem with the hub area or center cap footprint of any Torq-Thrust."