'67 side mirror ???

[slowcpe]

My truck did not come with side mirrors and a PO had the holes filled in. Not sure how they drove a small back window truck with no side mirrors or I'm just not man enough to. Fortunately I can see 2 of the 3 holes on the drivers side but not on the passenger. I should be able to figure out placement off of that.

On with the questions:

I purchased a set of "sport" mirror arms from a board member and a set of round 5 -5/8" round mirror heads from So. Ky. Classics. I did not notice until yesterday while I was painting the arms that they are different lengths. The passenger side is longer than the driver's. Is that suppose to be correct or do I have two different arms? Not knocking the seller, just curious if that was the way they came from the factory or I have a mismatched set? Its real hard to tell the length difference until I lay them side by side.

Also, how do the arms screw in? Do they require nuts or do the screws simply clamp down on the sheet metal? I haven't taken the door panels off yet to reach back and see. I purchased new mirror bolts from So. Ky Classics as well along with gaskets. I didn't see any type of nut/washer kit.

Installing these are next on my list and just trying to get some insight.

Thanks in advance.