I see this on Ebay constantly. A /5 tank, obviously because it has screw on emblems, and the seller advertises it as suitable for a /6.
Then somebody posts here the other day that the screw on emblems were carried over into the first /6 tanks.
I have never seen such a tank. I have in my possession a tank that came off a /5 with stick on emblems. This tank will not fit a /6 because the under tank space is not big enough for the Master Cylinder.
I have heard that a screw on emblem tank exists that will fit a /6...Please post a picture of the under side of this tank. I don't think there is such a thing.
My experience is that screw on emblems means it's a /5 tank. Stick on emblems means it is a /6 tank. There are a few /5 tanks with stick on emblems.