GregF.
Yes the two bolts screw into tapped holes in the steel pad backing plate, usually with a tubular sleeve .
The spring sits between the bolt head and the caliper body and pulls the pad back against the body or any adjustment shims.
I prefer the spring return caliper to the self adjuster.
In my experience the self adjuster suffers from poor pad retraction and with no need for adjustment, the pistons end up too far out of their bores leading to worn calipers but ’ each to his own’