I looked on Woody's home page, they don't list a dual carbide for that model.
Must be something about the shape of the ski. You may want to call 'em and ask what the difference is; they list the part number for a 2006 on the DennisKirk page I linked.
Woody's contact info...
International Engineering & Manufacturing, Inc.
8:00 a.m. to 4:30 p.m (ET), Monday through Friday.
6054 N. Meridian Road
Hope, Michigan 48628
Phone: (989) 689-4911
Fax: (989) 689-4910
Email:
woodys@wiem.com
__________________
2007 RMK 700 155", 2008 RMK 600 155", 2006 RMK 600 144", 98 Indy 440, 95 Prowler 550 2-up, 1990 Indy 650
RIP, destroyed by fire 1-22-2008

04 RMK 800, 05 RMK 600, 02 RMK 800, 97 RMK 700
http://www.avalanche.org/accidents.php