I make all my couches in the Colorado collection or Bonaire collection from Restoration Hardware but make them fit the standard size cushions that you get from all the big box stores
4 ,6,8,10 ft and 24 inches deep.
Here are the links
https://images.restorationhardware.com/content/catalog/tearsheets/Furniture_Colorado.pdf
https://rh.com/catalog/category/products.jsp?categoryId=cat16180056
Colorado 6ft 550.00
Bonaire 6ft 650.00
Colorado 8 ft 750.00
Bonaire 8 ft 850.00
