The part number you're after is 180-200-06-19. Is listed as an unmarked callout, so it's not in the picture. Parts personnel should know these types of things and know to look for unlisted callouts! Sadly, it shows to be no longer available. However, the ones used on the 250L and 280SL look so similar I have to wonder if it'll work on a 230SL? That Part number 130-200-01-19. It wholesales for around $140 and retails for $190, and is still available. The picture below show the one on the 250 and 280 that is still available.