Hi I'm new to this site...

Can anyone help me out with a problem with fitting leather.

I have an 06 Audi a4 Avant S-Line 170. I recently bought some leathers off somebody who assured me the set would fit my car..and they don't. The front I have no problems with...the back seats sit slightlty lower and don't lock/click back when upright. I presume they are out of a saloon.

Does anybody know of a mod that I can do to fit these?
Does anybody know where I could get this done?
Anybody know how much the back set would cost would cost if I went to a "stealer"...?

Cheers in Advance.