I assume you did one of three things. Filled the holes of the front Z33 Brembo calipers, and then re-drilled and threaded them to a M12 threading. From there they were a simple bolt on. OR You drilled out the spindles originally to work with the Z33 Brembos. When you reverted back to the stock brakes, you drilled and threaded the Z32 calipers a M14 threading. OR Installed new spindles and Z32 calipers after removing the Z33 Brembos.

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