In a large bowl, cream butter and sugar until light and fluffy. Add eggs, one at a time, beating well after each addition. Beat in vanilla.
Combine the flour, baking powder and baking soda; add to creamed mixture alternately with sour cream, beating well after each addition. Fold in apricots and pecans.
Spoon into two greased 8-in. x 4-in. loaf pans. For topping, combine flour and sugar in a small bowl; cut in butter until mixture resembles coarse crumbs. Sprinkle over batter.
Bake at 350° for 40-45 minutes or until a toothpick inserted near the center comes out clean. Cool for 10 minutes before removing from pans to wire racks to cool completely. Yield: 2 loaves (12 slices each).