We measured the width and purchased a new roller shade from JC Penney.
When the shade arrived I found the ends were a bit different so I removed the new shade material from the roller and used clear, 2" wide packing tape to attach the shade to the old roller.
Clear as mud right? Basically I put the new shade on the old roller. You may not need to do that if your new roller ends fit.
On a related note, I had to remove several rivets on the interior of the door skin, around the perimeter of the window opening in order to access the old roller shade.
Lucius and Danielle
1992 29' Excella Classic
1996 GMC Suburban C2500 7.4L
2005 Chevrolet Suburban K2500 8.1L
Got a cooped-up feeling, gotta get out of town, got those Airstream campin' blues...