how you get 103 fcr bp with
grief/beast ?

Post D2 related questions in the D2 section, you will get better answers and that is where those questions belong.

Sorry I don't know this.

That's a useless breakpoint for your Barb.
37 or 63 fcr is the way to go.

Still, if you wish to get it, you should use this:
Arach
Trang Oul's gloves
2x fcr rings
20 fcr amulet
Griffon's eye (only for 25 fcr) or bugged Valkyrie helm - both options are pretty much useless

That's exactly 105 fcr.