Congratulations on completing your list. I've almost completed mine as well. I'm not sure if I've ever seen the #53 Red with White stripes though. The only #53 I've seen is the Red, White and Blue (LeMans?). Is the Red/White #53 similar to the #91's and #51? Where did you find it? I need it!
Heh, there is no Red with white stripes #53.
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After looking for that car FOREVER, a guy on adiecast forum let me in on the fact the #53 car was made by a guy (that is his picture) who went to an ALMS race a while back and saw the #53 race. Since there was never an official car released from Auto art, he made his own. I felt like an idiot after spending all that time looking for it.
I guess the hardest car to find for me was the yellow #33, which I just happen to run across, at an online diecast store. The guy happened to have one left, and in the year since I had decided to find them all, it was the only one I ever saw. The #94 and #56 were also harder than the rest. Anyways, good luck, there are currently 14, but Auto Art will be releasing a 1999 Team Chamberlain car later this year.