What seal for 904 tail shaft?

I have a 71 Dart with 318 and 904 tranny. I purchased a tail shaft seal from Rock Auto. TIMKEN 8935S. It's too small. Anyone know what number it would have used if it had the bigger seal?

Thanks!

904 uses 1 size, the 727 uses a larger 1.

The Timken number is 2506.

Could they use different sizes for different years? I think my trans is a '74 model. Need to verify.

Anyone have an idea of what that Timken 8935S seal goes to

http://www.transmissionpartsusa.com/A904_TF6_transmission_seals_s/9235.htm

shows two different sizes....pre 72 and later 72

http://www.bulkpart.com/2/category/A904seals.html

same links i post for you over at FABO

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The Timken number is 2506.

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Thanks John, this one worked. I guess it definitely is a post '72.