the off side refers to the side that is not next to the kerb, so for us the off side is the drivers side as when you sit in the car you are on the right hand side

the near side is nearest to the kerb so as a passenger in a right hand drive car you would be on the near side

this doens't matter with the sensors

the granada ones are the same but they have an extra bit of suppresion on them to counter the extra electrics they have in the higher spec cars over the sierra's