I have a cracked windshield on my 77 280z. So my question is,does the front windshield from a 240z or 260z fit a 77 280z? Been eyeing this abandoned, what appears to be a 240z frame, in my neighborhood that only has the windshield. No parts,doors,nothing but frame/w windshield. Gonna get it anyway to start my second project.

Yes they are interchangeable. I checked by looking at Motorsports replacement windshield specs. Here is the link. Good luck on purchasing your second project.

http://www.thezstore.com/page/TZS/PROD/30-3051

Bryce