Convert Bachmann Spectrum K4 from Hornhook coupler to Kadee?

Model Railroader General Discussion (Model Railroader)
1

How do i convert the coupler on the Bachmann Spectrum PRR K4 from Hornhook
Kadee? Also which Kadee would work best?

2

Review the merits of this www.kadee.com recommendation,
http://www.kadee.com/conv/pdf/b30.pdf