Barry the 3 tabs that you refer to as 69 and earlier came back into play after 71 on most covers, other than that I pretty much recalled it the same as you did. But according to my one original (orange with 3 tabs) paint set, at least some 70-71 340's had them as well which is one of the reasons I posted, trying to learn more about the various applications over the years but particularly 70&71......Hopefully someone can dig up that old thread.