FLM Extended Stampede Arms

I'll give FLM a call. However at this site at
http://www.rc-monster.com/proddetail...LM24100&cat=31
A snipit of the product description states:

"Rustler/stampede Extended Front A-Arms
Extended .320 and .500 for the ultimate in handling..."

(My emphasis on FRONT)

If they are supposed to be the same, why the above description? Please clarify. This whole FLM chassis build has been my 1st outside of my stock Pede. All this is fairly new to me.

Regards,
Bart