I didn't mean to type thr "?" at the end, I know HTT offered a larger 4+" version (not sure of the size) because they asked me when I ordered mine a couple years ago. Sorry.
Nothing to be sorry about, they have a 4 3/8" outlet for the 3rd gen flange. Just pointing out that he said 2nd gen, so more than likely it was the smaller 4" HX40 version.