I am needing to replace my heater hose, but every auto parts store has the heater hoses as two competely different hoses. But the hose on my car has two hoses but in the middle of the two hoses is like a black plastic coupler or something to that nature where both hose run through. I was wondering if it is okay to have the two seprate hoses without that black peice which is what the auto parts stores sell, or do I just need to bite the bullet and go to the dealer an see if they sell that hose?