R and P Carriages 7000# Tandem Axle Spring Hanger Kit Fits 1- 3/4" wide Springs (used on 2,000#, 3,500#, 5,200#, 6,000# and 7,000# Axles) When used with "standard 25.25" eye to eye leaf springs, 1 3/4" wide, brackets should be installed 29.25" center to center on your frame Spring hangers are meant to be welded on, and may or may not include extra 2 holes in the base.