I was dissapointed when I could not find bumper covers for my '06. I came up with the idea of installing new production '79 VW bumpers on my car. I cut them in half I used 2 rear bumpers to make a front bumper. They cost about $80 each and only needed 1 front bumper to make my rear bumper. The rear had a gap that was filled by a licence plate holder/frame. It was pretty easy and really looks retro.
I like the '05 grill better and would like to find a chrome egg crate style grille to replace the '06.
I also modified a GEM hood ornament to get that 40's look