I'm sure the 748/916/996/998 units will fit just fine. I think you'll need a different bracket tho (the one at the back) cos they're a different profile.
Just bought some spacers from a Local Duc Dealer £5 each also the right lenght bolts . You need them to raise the bracket up so the seat clamp will fit properly with out the use of the side sucureing tabs that you use on the bip seat. 4D
1X 82711201A Plate,Mono onto Bip £24.40 2X 71311091A Spacer 3.82 2X 77950091A Screw O.12 1X 59510271A Mono seat pad 47.09 + VAT The parts that came with mine.
A genuine single seat with the parts to fit cost £400 from dealer,thats not bad considering it fits perfectly straight out of the box,its easy to spend that much on aftermarket gear thats poor fit/quality especially "carbon".