[dwcsr]

What I've done on the ones that have that gap is trim the front of the rock a bit and take a wide blunt chisel and drive the 90 degree corner back a bit. You can also slit the back edge and move that forward a bit and it usually all lines up. don't move it to far or the door edge will not look right on the rocker.

I've taken some apart that had that gap so I think its just how the trucks were made some times