airbag help pleaseeeeeeee :(

hi there guys,

me and a friend are looking to buy an a4 that we have seen, which requires a bit of work to the airbags. the car requires a drivers airbag, passenger airbag.

1.) drivers airbag - is this simply a straight replacement, or does the whole steering wheel need to be changed? i have seen driver airbags sold seperately on ebay so im assuming theres no need to change the steering wheel aswell????

2.) passenger airbag - i understand in order to repair this, we must replace both the dash and the passenger airbag, as the airbag has caused a split in the dash making a new dash a requirement.
are the dashboards the same colour throughout the b7 range or do they vary in terms of se, s line, colour of interior and so on???

3.)once these parts have been replaced, will we require new sensors and would we require a new airbag control module or are we able to reset the existing one????

4.) And lastly, are the dash's different for the saloon and avant???

sorry for all the questions, hope you guys can helppp

regards,

mo

bump, anyone??