Newbie B5.5 with some questions

[Rossey]

Hi guys,

I've just bought a 5.5 130 4motion.

Turns out it was a paramedic car, still has the blues and twos ;)

I've got a few questions

When should the cambelt be changed?
It's on 88k now.

Does anyone know where the sounder is for the parking sensors?

It's got 15" wheels and the tyres have had it, can I go for 16/17" or is the offset special being a 4motion?

Does anyone know the torque setting for the rocker cover as it's leaking and I need to change the gasket.

Also there's a bad vibration at 80, from the front wheels. What should I look for?