Friend has an E32 730, having seen it parked next to mine I would suggest it's unlikely to fit. Even without resorting to a tape measure or looking at the subframes the E32 is wider and longer and the seats (front and back are physically bigger. IMHO it's a non starter.....
Let me know if you follow this through though - the buffalo leather in the E32 is much nicer than the cracked black stuff in my E34