Who makes this fitted grommet for tube hold-down clamp opening?

[52 Bill]

Upon lifting the clamp off the tube, I suddenly was greeted with 4 discrete parts.....the two springs fell off the clamp and also came free of the chassis holes, and the black neoprene washer also fell onto the chassis, leaving the clamp in my fingers. Never use a single assembly when you can do it with four discrete parts that wanna go their own direction, I guess

I hate those clamps! After the first time you change the tubes in one of those amps, you learn to never release the tension on the springs holding the clamp. Grasp the rubber washer and hold it to the clamp. Pull up on the clamp keeping the springs taut and move it off to the side so that you can use your other hand to pull out the tube. Now insert the new tube and reposition the clamp on top.

If the clamp does come apart start by hooking one spring to the top clamp. Take the other end of the spring and hook it into the chassis hole. Pull up enough on the clamp to keep the spring taut. Now hook the second spring onto the chassis and then connect it to the clamp. Just keep enough tension on the springs to keep everything held together until you get it back on top of the tube.