John Deere use the auxillary sockets as fitted to the GS's on their tractors. The plug (male end) is better made, has a right angle in it, better for most applications I reckon, 'cos it don't stick out as much AND it comes with an adapter to fit a car ciggie lighter socket!
It costs a staggering £3.81 inc vat
Part No. is JW-DP252
It costs a staggering £3.81 inc vat
Part No. is JW-DP252