rooflight choice for 92 trident

Need to replace rooflight and purchased lovely MPK clear dome with blind and flyscreen.. Unfortunately dome is much bigger (as opposed to cutout/hole size of 400x400 which is same). This means dome does not fit because of 'step' in roof. Shame because its so much nicer than old one. MPK or Fiamma seem like only choices...really wanted clear dome and ability to open in any direction. Fiamma have crystal dome but open only one way and mpk open in diff directions but look like something from 1960s and aren't clear. Any other suggestions ? Size of actual dome can't be more than 47cm square.

And mpk one for sale now...been in garage for year but untouched.

My Fiamma crystal one has gone yellow. What about Heki?

Frank