5k/V8 backlight roller shade

[LToy@aol.com]

Yesterday, I saw a 5000 turbo fwd (~ '87-'88) in a parking lot with a
backlight (rear window) roller shade.  It appears to be factory installed,
pulling up from inside the parcel tray behind the rear seat back, clipping to
the top of the backlight.  The only other one I saw was on a V8.  I think
this is a great idea, especially to keep sun off the leather, without having
to tint the windows...and of course, I'd like one in my car.

Has anyone ever retrofitted one of these?  Looks like I'd either need a new
parcel tray or have to cut into the existing one :(  Ideas?  Anyone else have
one?

TIA,
Linus.
LToy@aol.com