What Ferrari's has 4 seats?

That depends on what you call a genuine four seater. Ferrari has had a long line of 2+2 seats meaning that there is actually 4 seats however they shoudn't be confused with the true 4 seater coupes made by BMW, Mercedes, Masserati etc. Some of Ferrari's 4 seaters include 250GT, 330GT, 365GT, GTC/4, GT4, 412, 456 and 612. That's eight on my count