I installed 15" steel wheels on my 1969 280SE cab. The wheels were purchased from my local Mercedes dealer (RBM of Atlanta, 770-390-0600, ask for Jim in Parts) and they were shown as an alternative listing for German cars with "heavy duty" use, particularly ambulances. They were NOT cheap - about $400 a wheel! But what a difference in the ride and stance of my 280cab. Conversely, on my 113 (1970 4-speed) I used a set of 16" BBSs from a 126 sedan. They are big, but give the car a more serious look while still looking "period correct". Mainly, these upgrdaes got me away from the dearth of tire choices in 14"!!