If you have a hybrid 7bolt/6bolt then you should have made sure the water neck, thermo housing, and water pipe are correct for the vehicle it's being used in or hose is correct to match. There are slight differences in these components, You may need to trim the hose slightly to make it fit. You should be able to get a lower hose from practically anywhere.
What Intake and water neck, thermo housing, and water pipe are you using? 1g or 2g?
Still want the part numbers? Here ya go
1g lower hose
MB356992
2g lower hose
MB906429