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Hoping someone can help me... I'm looking for a source for the small #4-32 brass screws that hold the wires in the connector where the horn's harness connects to the main harness.

See picture below. The screw goes in the hole in the middle.

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Just asking, 4-32 seems to be an extinct bird, are you certain it's not 4-40 which is the standard item? I checked several places for 4-32 machine screws and came up empty. I even came up empty checking suppliers of obsolete threading dies for anyone with a 4-32 die. At this point the only thing that occurs to me is to find someone with a suitable lathe and have them thread you a length of brass rod to 4-32 and make your own from that.

Definitely not 4-40.

I checked eBay and found a few but they either have the wrong head type, wrong metal, wrong color, wrong length, etc. They're supposed to be 1/4" long brass flathead screws with a "flat fillister" head style. See the picture below.

I wound up buying some round headed steel ones, painted black just to hold the wires in-place until I can find the correct ones.

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As a journeyman prototype machinist, that screw size was one I never knew existed until now and, as I was curious, I looked it up. Some thread charts have it while others don't but I did see that someone on eBay recently sold a box of them a little longer than you need but perhaps the buyer is willing to share! Unfrtunately I didn't save the address to the closed item but a search should bring it up.

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Yeah, apparently it's an old thread style that seems to have been discontinued around the 1950s-60s.

Believe it or not, there was also a 4-36 screw as well. Most of the ones I found were for Lionel Trains.