Well, you guys tried, but the tallest and shortest is actually, wait for it: Dario Fo and Nadine Gordimer.
Dario Fo is actually 6 ft 2, Gordimer is 5 ft 1, shorter than Faulkner.
Although most Nobel laureates fall in the short/mid height categories (based on the writers I found information about their heights) there are some laureates that are tall. Some of these lauraates that are tall:
Dario Fo
Camilo Jose Cela
Ernest Hemingway 6 ft
Jose Saramago
Wole Soyinka 6 ft
Samuel Beckett 5 ft 9
I couldn't find the height for Cela and Saramago. The same for many laureates from early years to about end of second World War. If writers like Tolstoy and Norman Mailer were laureates, we could have had a different list; for Mailer is taller than Fo.