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Your installation will depend on what you have in place now.
You have several options.
If you have the OEM pads you can trim the interior edges. You can replace the pads (Sue @ Twin Cities) or install another material like 6 Dri-Dek squares (in almond).
I would take this opportunity to replace the fuel line and primer bulb(s). Go with alcohol resistant hose (i.e. Trident) and OEM bulb. Stay away from grey fuel hose.
I replaced the fuel tank on my 1994 Montauk with the 22 gallon Moeler tank. It fit like a glove, and fit perfectly inside the original pads. Plenty of clearance for the fuel line to access the hole. Really looks good under the seat.