Those speed nuts don't work very well. I call that type "sheet metal nuts". They are also called "push nuts" because you don't really screw them on, you push them on. There are round ones that work much better than those rectangular ones. I didn't like how poorly they held the lens in place, so I added Goop glue around the edges. That worked very well. The nuts weren't needed.
The posts in the turn signal cans that you push those nuts onto are about 1/8" in diameter. That is the size to look for.
Thank you Gordon
But I need the same as Gil show up.
Only two cramp at each nut.Must be rectangular!
The round ones are to hard to lose them by repair.
Most the dealers here sell the round ones,I say:no::no:
How does this look? 10 x 15 mm, the round hole part in the center is 2.7 mm dia, galvanised spring steel (verzinkter Federstahl). The shown screw is a #8 sheet metal screw (outside dia 4mm).
I have a couple hundred in my stash.