RE Rear ARB diameter:
I'm certain the rear 156 GTA ARBs are 16mm,
I'm pretty sure the 147 GTA ones are also 16mm.
However the 3.2v6 GT has 17mm ones.
Eibachs (same one for all 156 variants) are 18mm.
The excellent Whiteline 147 GTA extra heavy duty adjustables are 20mm and also fit the 156 GTA.
(They also do 18mm as well)
Cheers,
TB
Originally Posted by GhostyDog
Front 156 22mm
Front GTA 24mm
Front Eibach 26mm
Rear 156 14mm
Rear GTA 17mm
Rear Eibach 18mm