Does this coupler fit my model?
Yes, coupler part number 9704230 is the correct coupler for your unit.
What coupler model do I need?
Answer Hello Linda. You need part number 9704230.
I need kitchen aid model no KSB5ER3 drive coupler? Serial no wl3171773.
Answer Judy, according to the model number given the replacement coupling is part number 9704230. Thanks!