After thinking about aftermarket bumper fillers for a few months, I've decided to bite the bullet and buy a set of NOS ones.
These are new, never installed, drilled, modified in any way, as received from Danko (the gray ones) rear bumper fillers. $150 shipped lower 48 U.S.
I also have a set of new Replica Plastics (the white ones) fillers that I bolted to my car. These are also as received from RP. They come already slotted to mount them. Same price, $150 shipped lower 48 U.S.
These are new, never installed, drilled, modified in any way, as received from Danko (the gray ones) rear bumper fillers. $150 shipped lower 48 U.S.
I also have a set of new Replica Plastics (the white ones) fillers that I bolted to my car. These are also as received from RP. They come already slotted to mount them. Same price, $150 shipped lower 48 U.S.