I was cleaning up my vintage bike crank arms, and somehow ended up losing the nuts/bolts that would screw my crank arms back into the bottom bracket.
Started asking my bike shops only to find out this kind of bottom bracket is quite old since you need a nut that screws on the outside instead of inside as are most vintage squared taper bottom brackets. Here's a pic of what I have:
I found online also the picture of the nuts that I lost:
My problem is that I can't find these at any of my local shops.
Question: can I replace these with just regular nuts + washer I can find at hardware stores?
EDIT note how the nuts had a rough surface in the washer part making me think that just a regular washer wouldn't do: