How to differ Firebird 70-72 and 73 nose?

[Ripper]

I found a early nose for my project. However, as I understand - there are differences between the 70-72 and 73 nose.
Could someone help me identify the nose on the Pictures? Is it a 70-72?


https://static1.pt-content.com/images/pt/2013/05/2E87261B88E84B919D32BA344400F0A545051000-1.jpg (http://s1356.photobucket.com/user/sebringZ28/media/Parts%204%20Sale/2E87261B-88E8-4B91-9D32-BA344400F0A5-45051-000030B4BBEB7219_zps00af3721.jpg.html)
https://static1.pt-content.com/images/pt/2013/05/5DE9B1BAD94449098B823E060540231E45051000-1.jpg (http://s1356.photobucket.com/user/sebringZ28/media/Parts%204%20Sale/5DE9B1BA-D944-4909-8B82-3E060540231E-45051-000030B46290533D_zpsa93cbca3.jpg.html)
https://static1.pt-content.com/images/pt/2013/05/AC078183630E45C99996FFF884021C0645051000-1.jpg (http://s1356.photobucket.com/user/sebringZ28/media/Parts%204%20Sale/AC078183-630E-45C9-9996-FFF884021C06-45051-000030B42C5441C2_zpse29e8b4c.jpg.html)

[Takid455]

grill openings in 73 are bigger. Not a lot but enough the grills wont interchange. Also supports in the back are different.

72 nose
https://static1.pt-content.com/images/pt/2013/05/IMG_33072-1.jpg (http://smg.photobucket.com/user/Takid455/media/1972%20TA/72%20ta%20dissasembly/IMG_3307-2.jpg.html)

https://static1.pt-content.com/images/pt/2013/05/IMG_33002-1.jpg (http://smg.photobucket.com/user/Takid455/media/1972%20TA/72%20ta%20dissasembly/IMG_3300-2.jpg.html)