For the price of one (1) Mazda OEM or Ishino Crankshaft Seal you can have this complete set that comes with National Crankshaft Seal 710355. I used all the other gaskets and give the crankshaft oil seal as I already had a Timken. It's made in Mexico if you're interested. I wouldn't sweat it. I know most Miata types will not use anything other than Japanese Mazda OEM or Ishino seals. But remember that this is basically a Protege engine. If the rest of the car was a Protege, would you still insist on using twice the price OEM parts that aren't necessarily twice as good?
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