I need some parts

I am working on my sons 73 Dart Sport. A lot of it was in pieces when we got it and cannot find some of the parts that was thrown in the trunk. I need the bolt that goes in the latch that opens the hood. It looks like it may have a collar on it too. Have no idea what I am looking for. I took a pic as to where it goes. I also need a gas cap for it and I need the big bolt that attaches the 90degree oil filter adapter to the block on a 360. I assume you need a rubber washer between it dont you.Let me know if you have these items or where I can get them. Thanks,Bill