Originally Posted by sandys
Yup 147GTA rear is 16mm so is the 147Q2, the front is probably 24mm not sure but besides that the GTA has additional stiffening plates on the subframe over a standard 147.
V6/Q2 rear bar is 17mm on GT, 14mm on stock models.
I'd go along with that. If the 156 workshop manual is anything to go by;
17mm rear, same ARB as GT V6/Q2.
23mm front diameter though, same on both GTA's, Q2's & GT V6.
Guess the 147 rear ARB's are shaped to fit around the floor because of the shorter wheelbase is the reason they are different to the 156/GT's.
Is the 147 GTA/Q2's definitely 16mm?