When I ordered a Suzuki Sidekick Donut Gasket

Advanced Adapters gave me a 60mm inside diameter
Oreilys gave me a 42mm I.D. gasket.

Does anyone have a sure bet part# or source for correct part number?   I measured right at 54mm Inside Diameter.

Called local Muffler Guru's and they comment "Its a Suzuki.. Who the Hell knows"

This particular sidekick has been the biggest bastardized vehicle Ive ever owned so maybe its not even a Sidekick Mani...?