When I had the windshield changed in my 70 2+2 convertible & 70 Parisienne 2 dr hdtp last year, they shared the same windshield. I suspect you'll see the same for 68. My windshield is different than yours as I have the antenna imbedded in the windshield. Call Speedy Auto Glass' 800 #, they were very helpful for me.
another quick FYI. Speedy Auto Glass also confirmed it was the same as a US Catalina or Bonneville. Just keep in mind different part #'s for clear, clear with blue across the top, and tinted with blue across the top.
#660... (tint/shade) 'Vert, 2-dr and 4-dr H/Top... Chevrolet and Pontiac... $349 list... I am sure they would do better, much better comparing my cost! (I install)
