Rattle left rear

Just checking to see if anyone else has had this problem and what their fix was. I have aftermarket rims and tires new shocks and h&r springs. This recently started and I can't find the source. I've checked everything I can think of back there but I just can't track it down. All the bolts are tight from puttin new shocks and springs on. I thought maybe it migh have been in my rim or something but I can't hear anything when I bounce the wheel up and down. I kicked my tire when it was back on the car and it made the rattle noise. When the rim and tire is off and you hit the brake drum it doesn't make the noise. Hopefully someone can help me with some ideas or opinions

This may sound really stupid but do u think something is in the tire/rim combo like a broken valve stem or something. I once drove over a bolt on the express way and my tire sounded like a baby rattle- but I also had a 3/8 inch hole in the rim

My bad just re read ur post u already checked...

Ya I'm lost. Might just have to tear it all down piece by peice