The Wilwood E-brake caliper has a groove on the top for the caliper to slide back and forth on. It needs to slide because it has one piston. It uses a simple cam lever to move the cup.
I made a bracket for the MGB a number of years ago. When I did instead of using the groove I mounted it on rubber pads. In retrospect I should have built the sliding groove. The rubber does not work too bad but I may need to adjust the bracket if the pads wear much. So far no problems.
You can see the groove in the top of the caliper in the photo which should have been used for mounting:
http://www.rc-tech.net/MGB/em/cor1.jpg
http://www.rc-tech.net/MGB/em/cor2.jpg
http://www.rc-tech.net/MGB/em/fab1.jpg
http://www.rc-tech.net/MGB/em/fab2.jpg
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