Replacement layers cannot be ordered online -- you must call to order.

Model 100 (click image to enlarge)

Width:

A. Measure batten width from end to end.

B. Measure inside edge of track to inside edge of track.

C. Measure outside edge of track to outside edge of track.

D. Measure outside of bracket to outside of bracket.

Length:

E. Measure bottom of bracket to window sill or floor (if it's a door)

Model 400