GTD Filing Cabinet setup: what is the hardware called?

[gandalfrat]

What is the piece of hardware called which pushes files to the front of the drawer as described by David Allen in his GTD books?

I went to OfficeMax and OfficeDepot today and neither could "name that hardware". They also carried no file cabinets which had that hardware-- everyone has Pendaflex frames for insertion into file cabinet drawers.

I came home and did a quick Google but had no luck either.

It looks like most metal filing cabinets have a series of holes drilled down both sides and a system of ridges in the bottom to support some sort of metal flange which would could be moved forward and back in the drawer but I've not found a supplier of such hardware.

Thanks for suggestions.

Regards,

GR