Front Grease Seal Choices ('65 ABody 10" brakes)?

[dibbons]

I just removed seal "National 6840S" from the front 10" drums of the '65 Formula S. I see Autozone has another listed for 10" drums (center choice in photo). Just wondering what the differences are and what is the best replacement for my application? Thank you.

 

[geminimotors]

Cant speak to the quality of Autozone house brand Duralast. I’d prefer a National or Chicago. Is there any other parts store that stocks or can order National or Chicago?

 

[cudamark]

The 6840S is the correct one. The 8121S is mostly B,C, and E, body with 11" brakes.....depending on year.