I've tried to obtain the A-Spec version in the past with no luck. Most of the foreign Honda dealers I've spoken with stated it cannot be purchased separately. =(
So currently I only have the stock bumper and EuroR/Type-S lip versions.
Sherman is the only person I know that has an "04-'05 Modulo rear lip with plug.
Hey man, the rears weren't hard at all. THey knock out and have enough clearance to swap them without any modifications. I haven't got around to doing the fronts yet, but I may go the shop route. Because it looks like there is no clearance at all for the front studs unless you press out the bearing.
It wasn't that hard. Just start at any corner and peel it very slowly. Or you can take a hair dryer to it and it'll peel easier. I didn't use one. Then use goo gone to remove the residue left behind, depending on how slowly you peel. The slower you go, the less residue.