The sleeper sofa repair kit does not include the sleeper sofa replacement mechanism. Most often, sleeper sofas just require the replacement of the polypropylene deck that supports the mattress. Each kit contains a replacement polypropylene deck along with helical springs for perimeter attachment of the deck to the old sleeper sofa mechanism. If the original sleeper sofa mechanism is still in good working order, it is more cost-effective and easier to just replace the polypropylene deck. Designed for the Leggett & Platt Classic Square Sleeper Sofa The Hospitality Bed CLASSIC SQUARE Leggett & Platt Sleeper Sofa Repair Kits are designed to fit the Leggett & Platt CLASSIC SQUARE brand. Components sizes vary by width and can accommodate both residential and contract markets. Contract markets include hotels, motels, and resorts. Made in the United States All the components in this kit are quality manufactured in the United States. Model Number Information Please look for the Leggett model number sticker on your current mechanism and match it to the model number below. The model number of your current mechanism is the only accurate way to ensure a correct replacement. Please reference the chart below to find your model number. Available in the Following Widths: Size | Model 44" Twin | 3544, 4435 48" Twin | 3548, 4835 55" Full | 3555, 5535 60" Full | 3560, 6035 67" Queen | 3567, 6735 68" Queen | 3568, 6835 If you cannot find your manufacturer or model number information or are not sure which kit you need, please contact us.