Been working on fixing the rust on my 86 k5 military blazer, and have yet to figure out how the rocker panel parts go together.

87-chevy-truck-cab-replacement-panels-qsz7w7rrone9fbr1.jpg

I've got parts 43,44,45
but have no clue how 44 and 45 fit to 43

can anyone shed some light (with some photos would be great)

or 44 and/or 45 not the correct parts?

help