Where can I find something like this or similar thaat could work ? Answered

There are so many manufacturers of Classic Construction Model trailers that you should be able to find one near you who may supply such a pin which you should provide a good picture to make sure we are all on the same page..

Then you might also try eBay...

I would have thought the manufacturer was a good place to start?

If it is just a pin (a picture might help) The any competent mechanic should be able to make one.

I found it. The company MEC is still doing it. I can't believe it after all this time.

thank you.