Bachmann GS-4 coupler changes

Does anyone know how you replace the dummy coupler on the pilot of a Daylight GS-4 from Bachmann with a Kadee or Ez-mate working coupler?

No recommendation listed on the KD conversion site. www.kadee.com/conv/list.htm

You could ask the bachmann Man or click on “Customer Service”.
www.bachmanntrains.com