I'm changing the cam seals on my '85 and noticed the new ones were different from the ones on it. The new ones came in a gasket set I bought a while ago but I never put two and two together because they look different from what is already on the car. The updated version requires a separate "arm" to go over the seal which is now an actual cap rather then an o-ring. I will say, the newer design look like it's less prone to leaking as the actual seal now is one piece rather then the older two-part design. I'm just wondering when this change was made since all 6 of the existing seals on my car are the older design.

 

Are these what you are talking about?
My drivers side looks like this:


My passenger side looks like this:

 

The top picture is the newer seal. Yours appears to be missing the arm however. The bottom picture shows the seals I've been removing today since they do a better job of pouring oil onto the exhaust then actually sealing.