Been looking for a used blade myself for the X500... As Sarge suggests, the 48" blade is the same for GX/GTs and the X500, but the frame is different. I know how much it sucks, because there are tons of the GX/GT blades for sale (and cheap too!) and very few for the X500s. Trying to decide between keep looking and waiting for a X500 blade or if I should just shell out the $$ for a new one. I'm sure they'll be readily available used in about 5 years. :crybaby: