Okay, here's the skinny on the CB antenna.

The L bracket is this: http://www.talleycom.com/store/product/ANXLBT3400.html (One of our suppliers) Reshaped in a vice, see the photos below.

The antenna is a Maxrad MLB2700. http://www.talleycom.com/store/product/MXRMLB2700.html It uses the same mounting as cop car, fire truck etc.

The mount is an NMO style. http://www.talleycom.com/store/product/ANXMBO.html