Each year, Levitt & Sons built particular sections and manufactured certain models, each available in 2 to 5 different styles. The 1957 Levitt Sales Brochure above shows that in 1957, Levitt & Sons offered the Jubilee, Levittowner, Pennsylvanian and Country Clubber models. All of that years models had similar types of features and built-ins. They ranged in price based on square footage.

A Total of Six Models Were Built In Levittown, PA
  The Levittowner
  The Rancher
  The Jubilee
  The Country Clubber
  The Pennsylvanian
  The Colonial

Levitt & Sons focused on low cost and efficient designs. Variety was achieved with the six house models, each in several different style variations and model years The model, year and style described the house design, such as "1954 Jubilee No. 1" below

All of these Levitt Houses had 5 Key Design Concepts
  Open Floor Plan design marked by a minimum of interior walls.    
  Picture Windows and natural light wherever possible.  
  Expandable Attic and/or Carport  
  Modern Kitchen with Built-In Appliances  
  Indoor/Outdoor Living with Common Open Spaces  

Other Built-Ins Could Include a  Hi-Fi and a Television To Levitt & Sons, a TV was an appliance. Levitt made money on the built-ins because their retail price was added to the sale price and amortized into the buyer’s 30yr mortgage. See the  TV and Hi-Fi built-in under the stairs.

Which House Models were built in each Section?
(data from Levittown Relics website)

# = Number of Houses built in that section
Date = Date 1st residents moved in
Jub = Jubilee model
Ran = Rancher model
Club = Country Clubber model
Penn = Pennsylvanian model
Col = Colonial model