Just off the top of my head, Ammonium Thiosulphate at 100gms to the litre plus a few grammes of an acidifying agent like Sodium Citrate or Acetate seems to ring a bell.(posted 8818 days ago)I'll look it up properly tonight, if no-one else comes up with it first.
Fixer strength should be different for films and paper anyway. What do you want to use it for?