I will defer to DD on this as well. But, my 1952 and my 1953 trucks both came with 1" mounts and the angled over shackles on them. I don't have my 1954 printed 9-8022 here at work to look at. However, the pictures in it show the angled over ones on all the trucks. Then, my 1952 printed ORD 9 which is basically a -30P manual has listings for both types of shackles and mounts. I don't remember what the pictures show in that one.