Rear brake calipers.
 

I have the 1983 Rear axle in my car and are having a time with the brakes. I understand that there are two types of brakes, regular and the SE ones. I got replacement pads and they ar loose in the caliper and go click whilst driving. So I think I have the SE calipers.

Where can I get the SE pads? And who actually provides calipers for this axle?

The car is a Lotus super seven. :)