I have the ones that adjust the shoe to fit the drum properly. Yes, the ones I need keep the rear shoes from retracting too far.
In that diagram, the part I need isn't listed. It's on the backing plate blacked out.
For emergency brake stuff, I do need one 2103, one 2104, two 2105, four 2106, two 2107, one 2108, and one 2109. Is there a kit made to do this?