Hi Richstang,
You beat me to posting this image, taken from an Ebay auction back in 2007. I did copy all the photos from the auction. Below is the description from that auction that talks about the Gerber R-model.
Cory
Legitimate 1966 Shelby GT350H (VIN SFR 6S1570) with a unique history.
This car was shipped by Shelby American to Hertz on March 31, 1966. Some time later in 1966 the car was stolen from Hertz and stripped. My husband's brother bought the stripped car from Marshall Motors, the Cleveland, Ohio, Shelby dealer. Along with a friend who owned 6S005, my brother-in-law bought a wrecked Shelby GT350 race car (5R099 -- the Dan Gerber car). Out of the three cars, they made two. The stock motor from 6R005 went into 6S1570 and some parts from 5R099 were installed into 6S1570 as well (for example, the roll bar and fiberglass rear package shelf).