powerglide front seal

what brand of front seal would you guys recomend?i found that my seal had been leaking so i want to replace it while i can get to it.

The black viton or used to be blue. Make sure the seal is not seeping between the steel part of tge seal and the pump. This is whereine is weeping from, making sure the seal and pump housing are oil free and a very sparingly film of sealer should go the trick.