Whirlpool Part Number 8211816: Sleeve, Motor Shaft

• SLEEV- SHAFT
• Works with the following models: Whirlpool 4KFP710WH0, Whirlpool 4KFP720BU0, Whirlpool 4KFP720ER0
• Whirlpool 4KFP720OB0, Whirlpool 4KFP720WH0, Whirlpool 4KFP750BU0, Whirlpool 4KFP750CR0

I ordered this for my Kitchen Aid Food processor and for the model it described as fitting, the KFP750. The part is quite a bit shorter than the old one, and a more narrow diameter. I had to pay almost $6.00 postage to get it and now more to return it. Not pleased at all. Who is responsible for the inaccurate description?