Springs fracture on all makes of car all the time. Being outside the recall list doesn't preclude the possibility. The recall covered a known batch of low quality springs and that's it. If you fit these gizmos, the chances of a bust tyre is reduced. A cheap insurance policy for all 75/ZT owners. Thankfully, 90% of fractures reported on the forums occur with the car stationary or just starting off. The colder months are statistically the worst for fractues of all cars across the board (AA report).
As to the bolts supplied with the kit, they're self tapping type. The holes in the spring cups are not threaded.
TC
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