I came to Allheart's site via a Google search. I didn't have much to go on - the model number of my Littmann steth wasn't on the instrument - but with about five minutes of easy looking I found the right part I needed. Ordering was easy, shipping fast. Seven bucks seems a little steep for a shipping/handling charge - but I didn't have to drive anywhere or search for a parking space. All in all, satisfactory and satisfying.