Having to get caster/camber plates all depends on how much the new springs lower the front end. If the factory plates allow you to get the camber within the spec you want you won't need them. I was just able to get the factory spec out of mine when I installed Progress lowering springs on my Cobra years ago. I now have H&R springs but I run more camber than the factory spec is.
Also, the struts won't be bottomed out even with the lowering springs and wear would be the same no matter if it is lowered or not. The only issue is whether the current strut/shock have enough rebound for the new spring rate. Do you know what the spring rate is on the H&R spring?
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