I wouldn't hold my breath.
I emailed them and this was their response...
"Hi Ken,
Thank you for letting us know about the restrictor.
I will forward the information to our product development team.
Thank you
Cold Case Radiators
2705 Clemens Rd B103
Hatfield, PA 19440 "
No mention of the brackets being to wide at all.
Yeah they aren’t going to do anything. The only thing they might even remotely do is include a note in the instructions addressing the restrictor issue. Once a product is released to production it takes an act of god to change it.