OK, I thought I'd make my full experience public. I submitted a support ticket on February 24, 2009 and got a reply offering me a replacement foam piece on February 26, 2009. It does not appear that they have a proper way to order parts because even the support representative's solution said that he "found one" in his test lab and that he would personally send it free of charge when I provide my address, so I don't know if anyone with a similar issue could get serviced that same way.
I replied with my mailing address in under three hours but, because I had developed a new problem with the handlebar remote, I brought the issue up too in case he would rather abandon this resolution in favor of a full in-warranty RMA (Authorization to Return Merchandise/Material) to handle both issues. Sure enough, he did want to handle my issues this way, but he did not reply to tell me so for 15 days (March 13, 2009)! I hadn't been silent either... I asked for a reply on March 7, 2009 when I had heard nothing for nine days. At least he thanked me for my patience.
He said he had already ordered a complete replacement kit from the warehouse and would be sending tracking information when he gets it and would like me to send mine back when I receive the replacement. It is very nice that they are doing this like an "advance RMA" without even asking for my credit card number, I but I think that it is probably because they are embarrassed that they forgot about me and don't want to make me wait any longer.