I am looking to buy a replacement case for the bridge humbucker on my Gibson studio. The damage caused to the original isnt huge, but the sound when played in the bridge position is really muddy and it isnt a great selling point if I ever want to get rid of it.

However, I am not sure of what size pickup casing I am looking for. The pickup is a 498T Alnico magnet humbucker. Many websites I have checked have different size options for the casing (1/3, 1/8 etc) and I am not sure of the size I am looking for.

Any assistance would be greatly appreciated, if any more information is required please say.

Thank you.