Can you help me identify a source for the following?

The extruded aluminium clamps shown below are used on the Wilson 6 element tribander, SY36. Though I could use ordinary worm drive clamps I would like to source the correct parts if possible. Any help greatly appreciated.

I also need a source for some suitable trap end covers. These fit over the 2" trap outer and the 3/4" trap input and out put tubes.