Does anyone know what thread size the small nut on the bottom of the fuel sender is? I'm cleaning and rebuilding my tank, and found this and the small retaining plate missing. I have used a magnet trying to find them in my shop vac, but to no avail. I did hear something rattling around before I vacuumed debris out. Tank has been dry and out of the car for years. I didn't expect it to be anything other than rust rattling around in there....

Happen to have mine in front of me. It is 3mm.

Thanks... I sort of assumed that. Of course all the local places only carry down to a 4 mm. I may end up having to order something online. I had to do that when I was rebuilding the carbs on my jet ski. Damn tiny screws on the throttle plates. Thanks again.