I have a '97 Land Rover Range Rover 4.0 and the (4) 02's are 12mm thread rather than the standard 18mm. I just received (2) standard Extenders that everyone is selling and even thought the seller assured me that these were the 'right' ones they weren't. FYI: 12mm also fits Toyota.

Does anyone know a source where I can get 12mm Extenders (2)? Thanks