That numbering system was so dumb. 10 years later and they all kinda mesh together. You would have to think long and hard to list 5 standouts from that line. Was it the 505A, OR 505C? Or C/A? Or maybe it was a 607 or 608? A,C,T, C/A or AT? ....I dunno, they all just kinda skid and laid off in the back.