Difference between 67 and 68 520 shocks?

[dibo]

So I'm trying to get some Monroe Max-Air's or Sens-a-Trac's (just dropped 3" and want to maintain some hauling ability), but I notice that nobody (including Monroe) lists them for 1967 520's, however both the Monroe site and Rockauto have them for the '68 520. Is there a difference between the years, or am I good to get the shocks for the 68 and stick them on my 67. Logically, I can't see that there would be any difference and everything should be interchangeable, but then again I'm not as knowledgeable as some on this board and figured I'd ask before sending in an order.

 

Thanks!

[Charlie69]

As far as I know 65 to 80 520,521,620,& 80 720 al used the same rear shocks. If I am not mistaken even the D21 use the same rear shocks.