Where can I get a gasket for an Apex N1 exhaust
rx7store.netthis should be what you are looking for. when in doubt, for aftermarket stuff, they pretty much carry (or can obtain) whatever it is you want. for stock stuff, talk to Ray Crowe at Malloy Mazda.
Or, if you are just needing a 3" exhaust gasket, go to your local muffler shop - they should have them in stock.. You might have to tell them it's for a diesel truck application - some shops have no idea why someone would run 3" diameter piping on a car... 
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