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I think the cause of the failure is that the molded in boss for the grease is shearing under load and causing an initiation point for the bushing to split. Both failures occurred in the middle of the bushing and the boss was sheared off. Additionally, the bushing height is 2-3 mm above the bracket. When the bushing is compressed it goes oval shaped and limits the contact surface area with the sway bar. There are also air bubbles close to the molded boss on most of the bushings. BMR sent me eight of them free of charge.
Mods:
1. Shaved the bushing to just above bracket height.
2. Removed the molded grease boss. The bushing greased better without it.
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