Rear spring hanger eye to shackle hanger eye (1 Viewer)

[abosely]

I know this is in a post somewhere, but I can't seem to word it correctly to find it.
I have a frame dimension drawing but it only shows top view of frame not side measurements.

What is the rear spring hanger eye to shackle hanger eye on a 60 frame?

Measured horizontally not along frame.

Thanks, Allen