So the business ends are identical, just the plugs and length of wire aren't.. yet the 2 different part numbers have a price difference of £20.. that sucks.
For info (mainly mine).. the numbers are:
FRONT - OZA531-GM6 / 1869 .
REAR = OZA531-GM3 /1864
Cheapest I can find at the moment totals nearly £130 for both.