Oliver part # for regular steering 550 [Delco Remy 1100 314] is 1K-7351-G up to 550 serial number 117378. Oliver 106900-AS is listed as an alternative for same models.
Plus one other is listed in my parts book for 550 serial number 107379 onwards - [Delco Remy 1100419] Oliver part # 106 971-AS
Oliver part # for power steering 550 [Delco Remy 1100 322] is 1K-7351-J for 550 serial numbers up to 127369.
Alternate is 165347-AS [Delco Remy 1100345] for same serial numbers
106971-AS [Delco Remy 1100419] for later power-steering serial numbers.
Just to confuse you more, when coupled with the regulator they often have different serial numbers as a package.
Hope that helps? I do not have my Super 55 parts book with me today...