Here is a new never used original round  Orange  rubber handset coil cord made for  Western Electric 500  Desk telephones. Perfect and especially made for the G1 handset The 4 conductors are  color coded Red, White, White, Black.  Extra Long  could cut this  into 2 nice size desk phone cords 

Has restraints on both ends. 

 Great also for Stromberg Carlson 500 and ITT 500 desk telephones.