What is this seal called. Mine is leaking and i need to replace it. By looking at it, looks pretty easy. Is the dealer teh only place to go to get the seal?

 

The seal is called a countershaft seal.
A Honda dealer isn't the only place to acquire the seal, but it would be the best seal.
A seal, is simply not..."just a seal". Same logic as bearings here.....you get what you pay for.