gmosley - first pass is to try Rob @ Coherent Source Service.
Next pass is to know that a group of us are working on upgrade packages of parts and implementations for existing classic Thiel products. The CS3.5 is on the A list. New grilles will be made similarly, but out of much stronger materials and incorporate better diffraction reduction techniques. At this time, you might consider simply filling the top and side edge steps of the baffle with plumber's putty, play dough, etc. to reduce diffraction and listen without grilles.
Of, of course, scare some up from Rob.
Did you get the Equalizer?