DeGraff don't use any SFL bearings. I have a 1300kg Degraff too fitted with bearing savers but can't have a look for you as I am away at the moment.
I replaced my brake shoes recently and they were knott parts (203*40) but I notice the bearing seal number for the drums comes up on trailer tek as for peak 200 drums which may be a clue. What do you think Trailer Guy?
It is probably worth ringing Arthur at DeGraff with the serial of your trailer and he will point you in the right direction I'm sure.
Mark.