So I am still a bit confused. I can only find the CBS01 mentioned in one ARB parts catalogue and it isn't described or pictured.
The part I found in searching was this:
Old Man Emu by ARB, Leaf Spring Center Bolt, CBS01 - Desert Rat
Old Man Emu by ARB, Leaf Spring Center Bolt, CBS01 - Top brands, low prices, quality service, and fast shipping!www.desertrat.com
But what you guys are talking about doesn't sound like a bolt, but rather a cap of some sort that fits over the bolt?
Their photo is incorrect. Work with a Land Cruiser shop. This is the CBS01, needed on late model rears only when eliminating the isolators.