Product details:

The Lithonia Lighting Wraparound clear prismatic lens is made to fit the Lithonia Lighting Traditional 1 ft. x 4 ft. Wrap only. This lens is a replacement for the LB series. The lens is made of acrylic to prevent discoloring over time.
48 in. x 10 in.
This clear acrylic prismatic lens is compatible with the Lithonia Lighting LB series traditional wraparound fixtures.
Diffuser for LB48", 2 lamp - T8 Lamps
Lens only
Acrylic construction
Lens only works with lithonia lighting models that start with LB 2 32 (diffuser for LB48 in., 2 lamp - T8 lamps)
Features:Replacement diffuser for 2-lamp
Assembled Product Dimensions (L x W x H):2.80 x 3.80 x 2.50 Inches