Everything depends on condition. Do you replace hoses because your radiator fins got clogged with mud? If they're cracked - yes. If not - why? IMHO, it's the same with u-bolts. If they look almost new, why replace them? If the threads are all rusty and the nuts look like crap, replace them.
1996 White ZJ
1987 Maroon YJ (sideways build)
1996 Forest Green XJ
The "sideways" build thread:
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