This Twin Sized Bed Deck Repair Kit is for Commercial use. When your sleeper sofa breaks down, the most common repair is to replace the mattress deck. This is a Leggett and Platt bed deck repair kit; Twin Commercial. It is a repair kit for Leggett and Platt models 3544, 3548, 4435, 4835. Please locate the manufacturer's sticker on the frame to find model number. 44" is the width between the two mounting plates of the bed deck frame. See illustration 5 for how to locate the model number and how to measure the mounting plate width. Please verify the model number before ordering. If you are unsure of the model number please contact us for assistance. Bed deck frame NOT INCLUDED.