hrm, i just measured mine earlier (14" long) and was going to get a replacement wherever. i didn't actually try to remove it, although it looked like a standard j-type blade replacement.
some info here: http://www.topix.com/forum/autos/che...KGN6ICP7KN15B1
i've also read that the following replacement blades work:
chevy no.: blade wsw 1039-2621
Trico: 45205 (need to trim)
ANCO: N-14R, 350 mm