That is a washer, non-metallic, paper, .040 thick, pn (victor gasket co) 26301. In other words it is a gasket that goes behind the seal to prevent the oil from sneaking around the outer edge of the seal. That was in the days before RTV. Put a slight film of rtv (automotive silicone...Room Temperature Vulcanizing) on the outer edge of your seal before installing and you'll be fine. Throw away the paper washer.
If you really want to be original, you can get some .040 thick gasket paper and cut one, but you really don't need it. Also, it will only work if your seal is a double sided case like what you took out. Most likely your new seal is a more modern single lip and open on the inside. The gasket will likely do nothing on that type of seal.
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