The headboard & footboard have brackets that are pre-attached to them. There are 8 bolts which will need to be loosened, Once they are loose, you can hook the side rails in and then tighten the bolts.
eBay
Folding sofa bed, dual-purpose multifunctional single sofa
Aliexpress UK
✔ High quality Linen divan base in Ottoman style. ✔ Very strong divan bed base. ✔ Available in end lift or a side lift ottoman divan bed. ✔ Whole base can be used for storage space, easily hide stuff.
eBay
Electric Genuine Leather Sofa Bed Convertible Recliner – Modern Sectional Sleeper Couch with Adjustable Seats and Chaise Lounge
Aliexpress UK
DIVAN BED SET PLAIN HEADBOARD. The Divan is Constructed using Premium British Timber. Complete bed set, Divan base + 24" Headboard+ Optional Mattress. 3ft Single: 90cm Width x 191cm Length. BED FEATURES.
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Vintage Style Flannel Fleece Blanket Star Moon Print Soft Cozy Sofa Bed Couch Car Office Camping Travel All-Season Gift Blanket
Aliexpress UK
Hazel Panel Wingback divan ottoman. Ourcurved wingback design adds a touch of sophistication, turning your bedroom into a haven of comfort and style. Embrace the feeling of being cradled in luxury as you recline against the plush headboard, creating an inviting atmosphere for relaxation.
eBay
Modern folding sofa bed apartment small apartment simple single and double folding sofa with armrest
Aliexpress UK
King size 5ft x 6ft6 divan bed base in black. 2 Drawers on side. BASES ARE UNIVERSAL, STORAGE CAN BE ON EITHER SIDE!
eBay
Entertainment Modern Living Room Sofa Designer Soft Nordic White Reading Sofas Bed Recliner Lounge Divano Letto Salon Furniture
Aliexpress UK
Each set includes three panels. Our smooth 9mm plywood is an excellent choice for supporting a bed base and mattress. They do not cover the full length of the bed, so you’ll need to space them evenly, leaving a small gap at both the head and the foot of the bed.
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Sofa Back Wall Shelf with Socket Hole Long Couch Back Bed Tail Bookshelf Wall Mounted Storage Organizer Rack
Aliexpress UK
The divan bed upholstered in a plush velvet fabric is an exciting addition to our ever growing range. ✔Choice of Standard Divan Bed, End lift ottoman or side lift ottoman. ✔Upholstered in luxurious, soft touch Plush Velvet or Boucle fabric that will suit any decoration.
eBay
Folding Sofa Bed Dual Use Single Small Unit Balcony Living Room Multi Functional Clouding Stretching Relaxing Sofa Two Seat
Aliexpress UK
Its grandeur design will create a stunning focal point in your bedroom. WILTON panel WITH BLACK PIPING bed features a strong solid slatted wooden base or available in storage option that acts as a flexible and supportive platform for your mattress.
eBay
Living Room Compressed Sponge Sofa Modular Sectional Sofa Bed for Bedroom Apartment Ultra-Soft Deep Seat Lightweight Easy Assemb
Aliexpress UK