Lincoln experts- '92 Continental Executive

How important are the torsion spring retainers on the rear spindle pinch bolts?
The manual says that these bolts are to be discarded when removed, which
is a no-brainer since it appears that they tend to break where the smaller diameter threads meet the large nut.
They seem to be a dealer only item, but the parts guy at the nearest dealer (25mi away) says, "That's a special order and, uh, duh, you're going to have to come here and show me a picture of what you want."
WTF? What part of "rear spindle pinch bolts with torsion spring retainers" is so difficult to understand?
</rant> critical are these retainers? The torsion spring assembly forms an inverted "U" at the top, which fits inside of a receptacle on the air strut. The retainers mount on the spindle pinch bolt a few inches below. If the retainers aren't there, will it be a Real Bad Thing(TM)?
Thanks, in advance...

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