question 1, does a 2007 mondy turbo deisel have a cam chain or belt?

question 2, regarding rear brake caliper CARRIER can you just buy the bit of rubber that fits onto the top sliding pin?

question 3, will I get away with fitting a bottom pin into the top?

The reason I'm asking the questions regarding the caliper pins is I have discovered that the rubber on the top pin has worn and is sliding over the pin, in doing this is making the pin near impossible to move and so wedging the caliper in place ie locking the brakes on, so I'm assuming that the rubber will be a dealer part IF you can just buy this bit or end up buying a full carrier(that wont be happening)