The base kit provides both types,(of bomb racks) and I noticed that the rails on the post war type were different proportions than the wartime versions. I think I used D35 parts for my USMC version. Both types are correct, just the year used application varies. I have the PE bits, and they do look nice when done; the center rack may want PE, the rest is mostly hidden. Thin the fins, and add braces from .010 rod; the PE props look good on the wee bombs.
I used a lot of Gaspatch parts for my kit as well. I rigged the upper wing with pairs of lines, and taped then up; when ready, I removed the tape, and pulled down each set as it was time to rig, from the inside out. I also pre-drilled the holes with a #78 bit, at as close to an angle as I could to bring the turnbuckles in line with the runs. Again, I used a straightedge to double check all the runs just to be sure in my own mind.