I found this seal online and it fits my blender. Please note that this DOES fit perfectly model KSB50B since this model is NOT listed on the AppliancePartsPros site as one of the models compatible with this seal. I am so grateful to AppliancePartsPros.com because without this part, I would have to discard this blender. You cannot buy GLASS blenders anymore which is a shame so I need to keep this going as long as possible. I ordered three of these seals since they do wear out over time. Don't hesitate to order this; you won't be disappointed.