Are print drivers supplied by Apple in the OS? If not then go to manufactors site and download.
I have downloaded the latest Epson driver (Version 9.17) but the print box from PS CS5 does not allow changing from the letter size to any other size such as 24 inch roll auto cut which is the desired size.
You'll have to talk to Epson about that.
Photoshop gets the list of page sizes from the driver, and can only show what the driver lists.