22120 is suitable for planer&thicknesser C2-410S and C2-410Q.

22050 is suitable for ranges of machines: 
Drum sander: MS3140C;MS3156C   Sanding machine: BS6X80C;BS6X90;BS6X100;BS6X110;BS8X100
Planer&thicknesser: MB502B;MB103;C2-260S;C2-310QS;C2-260(K);C2-260;C2-310Q
Panel saw: MJ12-1360E;MJ12-1600E-M   Spindle moulder: WS500F;WS700N Morticer: MS3016A

22090 is suitable for ranges of machines: 
Planer& thicknesser: MB103;MB104;C2-310S;C2-310 Panel saw: MJ12-1360E;MJ12-1600E-M
Sanding machine: BS6X110;BS8X120 Spindle moulder: WS700N;WS1000TA Combination machine:PM250/30-1200