Recommendation 3. make sure the hose he/she is suggesting or recommending is rated for fuel or vacuum or both. The hose typically used for windshield washer fluid is not rated for either. As noted, your old lines may still bear the markings that describe their diameter and function or application.
Don't expect your existing lines to have OEM replacement part numbers. Even the factory goes bulk, it just uses a machine to cut the tube to pre-determined lengths and bins them for delivery to the line. Dealers about do the same, only they tend to charge for both the material and the labor to cut it. Oink, oink.
Nick