This is a bearing spacer for front stub axles, 356A T-2 thru 356B T-6. The inner diameter of this spacer is 30 mm and it's pressed on to the spindle. Outer diameter is 40 mm.

Note: This spacer is also the sealing surface for the grease seal (356 41 448). It should be replaced if a groove is more than slightly present.

For 356A, see 356 41 447.

For 356C, see 695 341 661 01.