Ezafe when the last letter is a vocal

With words like erebe, ode, zanîngeha etc. would it be correct to say di erebeyê/odeyê de, li zanîngehayê or di erebê/odê de, li zanîngehê? I've seen both examples where the last letter is dropped and where -y + the suffix is added so I'm not sure if both are correct or if it differs from noun to noun which one is used.