Advice re: 2004 A8 L front and rear shock replacement
 

My front shocks "collapsed". Mechanic (very experencied and highly regarded Porche/Audi guy) thinks need to replace front air bags and maybe the compressor pump. Took awhile to get the money together. Car has been sitting for about 60 days. Now the rear shocks are way down.

I was getting ready to buy shocks from Arnott, but they don't sell rear shocks.

What's the alternative. Is it possible I don't need rear shocks? Maybe just front bags and compressor?

Any ideas/suggestions?