What are the dimensions for apartment sofas?

Simplicity Sofas (www.simplicitysofas.com) makes 3 different sizes of sofas:

Full size sofas (3 cushions) range from 78" to 89". (66" between arms)

Mid-size sofas (2 cushions) range from 72" to 83". (60" between arms)

Apartment size sofas (2 cushions) range from 66" to 77" (54" between arms)