Got a bed kit today and assembly tips would help

[Peanut74]

Today I put the LH rear fender skirt on. The part did not have a name on it so I do not know who made the part but it was 0.054" thick. This part is the worst fitting part of the bed kit so far. Once I finally got it in place the rolled flange of the skirt did not butt up against the inner fender. I did manage to hammer the edge over some and close most of the gap. I will need to add some material at the bottom to close up the gap.