Your Z32 wheels will NOT fit. They have 5x114.3 bolt pattern while the X has 5x120. All NA Z32 came with non-staggered wheels, and the TT came with staggered ones. It's not market variant.
I agree that the brakes on the Z are too tiny. I swap in the 13" rotors from a 350Z for the fronts.

You have the best color and model for E53

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00 E39 DINAN S1 //M5 (82k miles)
06 E53 DINAN 4.8iS, born 2/18/2006 (126k miles) http://www.xoutpost.com/bmw-sav-foru...s-my-dslr.html
90 Straman Z32 TwinTurbo Convertible, (1 of 44 ever made) 5 speed, 444rwhp/451rwtq
01 360 Novitec Spider F1 (26k miles)