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The spindles are either GXP or BB30/BBright (long enough to fit most BBs)
Arms are removable, and largely have the 8 bolt pattern, unless the spider is older and it has the Sram 3 bolt pattern (or you have the Specialized cranks)
If you don’t go for the DFour and Shimano rings, spiders are either standard 5 bolt, or 5 bolt sram hidden ring.
I have two quarq dfours, very happy with both of them.