Can't really help beyond bumping this. But I think this is a valuable number to have with the advent of the GTS.
"Significant reduction in ground clearance", off of the configurator. That sounds . . . significant. One of the big reasons I went with an S (with PASM) instead. Measurements indicated the new car should be similar in clearance to the Corvette I've had, and I didn't feel that I'd like to live with a "significant" drop in height. No information from the dealer. It's a simple matter to get a good measurement - they had a base, PASM and SPASM cars, and I was easily able to confirm the reported heights of these front ends.
Anyone with that option and a tape measure can provide the answer.