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Thumbnail Filmstrip of Hilborn Adapters for changing 4 bolt stacks to slip in - Tubing size 2-1/8" Images
Set of 4 Adapters to change the 4 bolt stack Hilborns with 2" Square pattern to 2-1/8" Slip in tubing can be bored out to 2-1/4"
these units were made 1970-1977
stacks were like this :
4