I've got several of these mounts and I will take some measurements to go with the photos tomorrow and post them.
For tonight, I thought I'd share with you all what the Chevrolet Parts and Accessories catalog, 30A, effective October 1, 1970 has for group 0.027 MOUNTING ASSY. - MOUNTING UNIT, Engine (also see group 4.081). This shows what Chevy was selling across the counter and using in their service department less than a year after the '69 Camaro production stopped. This catalog covers 62-70 Passenger cars, Chevelles, and Novas, and '67-70 Camaros.
What is interesting to me was that the original type mount posted in photos earlier by a couple of folks with the thick rubber at one end of the thru bolt to hold the engne mounting to the frame stand, seems to have been available in 'mirror' images for the left and right side...? (Types B and D in the illustrations).