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Yes it is normal, either that or a metal strap. Either is acceptable. There is also a rubber oring/rubberband, for lack of better term, that is under the boot on the rack. I actually just did this replacement myself yesterday. the zip ties are stout ones too, not your typical ones.
I'm sorry to hear that and your welcome. I'm a novice at the LRs but been working on off road'ers my adult life. Defiantly a learning curve but these guys/gals on here will get your sorted for sure. Good luck.