Yes sir I understand, but the 1-piece driveshafts that I have (AMZ and I believe z1) for TT 5spd and TT auto (with solid coupling) are also 4-bolt, with an adapter for the 6-bolt differential. The problem is the adapter is a different 4-bolt pattern. John at z1 said that probably the AMZ and Z1 have different patterns. Z1 will sell theirs for $85, meh