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These Tuff as nails raw steel struts mount on the inside face of your Shovelhead frame and follow the radius of your wheel and fender. 

Distance between fender mounts is 6-1/2" (same as stock 72-84 FX).

A nice 1/4" counter bore allows you to tuck in 3/8" socket head cap screws for a super clean look.

keep your swing arm and get rid of the outta place straight lines your stock struts create.