I'd call Glenn at Lakewood Hardware, but if you want plumbers' Satori, call Menyhart Plumbing, 631.5519 (6304 Lorain Avenue).
Check out their website at http://menyhartplumbing.com
because you may be able to order your part online and come in later to pick it up.
Some days there is quite a long line to talk with the pros. Menyhart is where the pros go.