They are just under 12" looks to be 11 7/8".
http://s1142.photobucket.com/user/52_Ton/media/Suspension/IMG_2152.jpg.html?sort=3&o=0
Mine is a 52 pick up and would assume would be the same??

Mark

Last edited by 52_Ton; 07/26/2015 12:26 PM.

1952 GMC 9430 one ton pickup, a work in progress

1952 1-ton pictures on Photobucket