Got the OEM windshield off yesterday and test fit the P4P Lexan windshield. Perfect fit (just like the rear window).
The 1/4" Lexan weighs 16 lbs. The stock glass a bit over 22 lbs. Was hoping for more weight savings, but the 1/4" (6mm) Lexan is thick and doesn't feel like it needs a center support rod. A thinner 3/16" (5mm) would've weighed less, but according to Peggy at Raceshields would've required support. FWIW, the OEM glass windshield is 3/16" thick.
Rear window is clear 4mm thick. Definitely too thin for a front windshield.