69/70 Differences?

[Truckhead]

I am trying to figure a way to quickly tell the 67/72 trucks apart from the outside. I know it's easy to seperate every 2 years by the grill (quickest way), but between each of the 2 year series groups is what I mean.

So far, through this board and reading some catalogues, I came up with this:

67/68 Side markers on front fenders....68 has them
71/72 Rear view mirror mount...72 is glued onto glass

What about 69/70?

I know there are more differences on the above, such as hoods, vent window mounts, door panels, etc., but I was thinking of fast IDs. These 2 years seem to be the toughest to distinguish between.

Just curious, but what the heck.