Welch Allyn can supply a, suitable cable unterminated so the correct connector for the defibrillator can be fitted.

Please find below the part number.
I have e-mailed the connection details required to make one up.

Catlog number 01050098
Part Number 008-0320-00
Cable, Real-Time ECG, 15', unterminated (Propaq CS & Encore only)


Jonathan Pope
Medical Systems Engineer
Welch Allyn UK