Yes, I'm looking for a set of black finned collars. I believe they would need to be split or two piece. If you look at my photo, you can see the spacer in front of the mounting flange. The spacer is welded to the end of the pipes and there is no way to slip it on the collars from the bottom and wrap it around. There is a crossover outlet that would prevent that. See the picture in the link. I'm in Ballston Spa, NY 12020