After some judicious sandpapering, I was finally able to fit the Clark's. That thing is snug. So much so, in fact, that I have a feeling it won't be coming out in one piece if I ever need to remove it. (Looks like I have a good excuse to put in an Ofrei order.)
As much of a PITA as fitting it was, I'm definitely much happier with the Clark's over the OEM rep with which this thing shipped. The rehaut is actually visible now, and the overall height is much more manageable.
Thanks for the help guys.