Like most things I'm sure you could make it fit. But you would need to do some cutting and welding.
I considered fitting the Golf R32 seats in my S4 as the stock S4 (B5) seats were far too wide for my medium build. But they are air bagged and I didn't want to loose this feature so I consideed the Recaro RS4 seats. However, they too are also a tad wide and thus I couldn't justify £1400 a seat. The R32's were a perfect fit gripping you at the shoulder instead of the waste like the S4 and RS4 seats. In the end I bought an RS4. - Not just for the seats I might add [img]/ubbthreads/images/graemlins/wink.gif[/img]