I don't know. The place we are putting the extra stuff such as XM, EQ, and some other stuff goes in the back panel. So it has to be the long one, they only make 2 sizes, a 5 ft and a 15 ft. I don't know of a place to get that cable except through alpine parts suppliers. It is a 13 din cable is all I know. Without it, no EQ. Not a major deal with the HU I have either, but as you see in some of the pictures, the EQ head is already been installed into the radio bezel. To change all of that now, would mean more money and probably another paint job on the bezel. So 1 delay causes another. I may tell them to hook it all up without the EQ and add the cable later. I mean the truck doesn't need to sit for that, but I wanted "EVERYTHING" done "BEFORE" I write out that final check. So yea, it is pretty important to me anyway.