Electronic cruise control

I'm looking at installing a Rostra electronic cruise control on the 67 Dart but have a question regarding the VSS. I want to install the VSS on the back of the speedometer head then connect the existing speedo cable into it. My question is all the listing for VSS say " fit's standard GM speedo cable" Does anyone happen to know if the nut-fitting on the Mopar speedo cable is the same size as GM??
Thanks,
Don