14inch wheels v 16inch on an early 308.

If you are sticking with the 14" XWX i have just checked the date code which is 0525. They dont get much fresherr than that. it generally takes some time to test the tyres and get them through the system. we rarely receive a tyre that is less than 2 months old.

https://www.longstonetyres.co.uk/205-70-r-14-michelin-xwx.html

Also if you are in the States its worth grabbing them while before they end up haveing some hefty tariffs applied

 

The Topher on YouTube.com answers this question fairly well.
My 80 GTBi (33111) was the subject of this very nice video.