After opening the paper invoice included with the order, i see its listed as 401112 - Solid axle front. A search for 401112 in serpent.com returns nothing. Serpent America returns Solid Axle RR and so does speedshop24.com.
EDIT: Not listed in the site but its listed in the manual. Nice to know the rear fits in the front. They should've just used the same design front and rear.