correct length cables 650ss concentrics

Hi everyone got amal 930 twin concentrics on my 650ss had a cable of rgm that was no good Issue is with the cable fitted there is no free play and it's lifting the throttle slides about 1/4 inch of the stop screws with everything set to minimum Brand new Doherty twist grip of Andover Norton the cables I've got both measure up from junction box to grip 80 mm of wire Not measured the other bits as they are still on the carbs Anyone had any success getting twin carb concentric cables ? For the 650ss or atlas (same fitment) from anywhereI had a look at Venhill but they don't know themselves which ones fit for the concentrics and Andover don't do themGot Vincent style flat bars onSuper appreciate any advice I'd make my own but really just want to get something of the shelf time wise as i need to use it to go to work onCheers