Are you asking about how many X-factor beams? I don't have them but I believe for two axles you'll need 3 to give the best in strength against the dual axle flexing. One set each in the front, center and rear of the wheel/axles. For 3 axle suspensions I imagine there would be a fourth. Anything less that this and I would think the system is not as good unless you had the full complement installed. I would certainly be curious to know the reasoning for any less than these numbers. Are you also implying you already have one or two? Then there's the choice in which location (front, center or rear) would be best. I didn't realize there was so much to think about with the X-Factors.
If you are asking about the number of shackle/wet bolts, they will replace the existing shackles, nuts and bolts for your suspension as a set - again no need to know how many are required because it depends on your suspension. These I do have and in the 3.5 years I have not seen any abnormal wear of the shackles, nuts or bolts. The prior factory set of shackles, nuts and bolts were a mess when they were replaced after only 1.5 years.
Enjoy your mods. Let us know what you do so the rest of us can drool.
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