Like Jon D says, you push it through the front, carefully, until it goes past the opening and relaxes to full size again ... as you are pushing it in, it's inside the frame of the glovebox opening where the mounting/screw holes are but once you install it, it's outside the frame:
[img]http://alanhorvath.com/54chevy/chevypics/flexfoam.jpg[/img]

Mine is modified, as you can see, to accomodate my AC/Heat Unit.

~~ Alan Horvath
1954 Chevy Pickup
Singing his praises in the
Passing Lane