Exhaust Nuts - GTO/3000GT
This is M12 x 1.25mm with a 17mm Hex which is quite rare.
This size hex allows you to use a normal socket on the front pipe to manifold studs
making fitting the frontpipe a whole lot easier.

Non Turbo Models use 4 of these on the frontpipe to exhaust manifolds & 2 of these on catalyst to middle section of the exhaust.
Twin Turbo Models use 4 of these on the frontpipe to exhaust manifolds, 2 of these on Front Pipe to Bottom of Front Turbo Elbow & 2 of these on catalyst to middle section of the exhaust.

For Exploded Diagram of these locations See HERE

Price is for ONE

Mitsubishi Part Number
MB059359

Gasket to Frontpipe and Turbo Elbow - GTO Mk2/3000GT

This Part Number fits all joints except Rear Turbo Elbow to Frontpipe
on Mk2 GTO 06/1994 onwards and 3000GT Models 06/1994 onwards
Exploded Diagram Showing Locations HERE

Fits Non Turbo Models Front Pipe to Manifold and to Cat
Exploded Diagram Showing Non Turbo Locations HERE

Mitsubishi Part Number
MB687002

Catalytic Converter Gasket - Mitsubishi GTO/3000GT

Locations are Both Sides of Cat on Twin Turbo Models
and Rear Part of Cat to Middle Section on NON Turbo Models

Exploded Diagram Showing Locations Fitted HERE

Mitsubishi Part Number
MB687004