When your sleeper sofa breaks down the most common repair is just a replace of the mattress deck. It is more cost efficient and time-saving to replace the mattress base. Each kit includes a replacement polypropylene deck as well as 10 Replacement helical springs that connect the bed deck to the bed frame. This is a Leggett and Platt bed deck repair kit; Twin Residential. It is a repair kit for models 1544, 1548, 2544, 2548, 2744, 2748, 4415, 4815, 4425, 4825, 4427, 4827. 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. Contact Customer Service For Additional Information and Bulk Pricing.