I won't using these since i'm awful at re-packing a car(i can unpack but i've never successfully re-packed a car in my life before) But still thanks a lot for taking the matter into your hands. Kudos.
You don't need to repack, if you manage to unpack the data folder, delete the data.acd file, so the game will use the data folder instead of the .acd file.
Btw CM has a "Pack data" option as well :D