The WC-15T is the full cabinet version. A WC-153 is a three sided case. Since the first two numbers are the same, maybe the WC-153 will fit. I think I would rather have a three sided case since that is what I have on my receiver. If I can’t figure out the right number AND find one for sale, then it looks like a WC-22 is an option unless someone could build a WC-122
this thread lists the WC-153 as compatible with a 5030 which has a 5 3/4 faceplate the 5020 is 5 3/8 thats why i think that it might not fit.
https://audiokarma.org/forums/index.php?threads/woodcases.297242/
