The ornamental design for an seatbeltconnector, as shown and described.
FIG. 1 is a front elevation view;
FIG. 2 is a right side elevation view;
FIG. 3 is a rear elevation view;
FIG. 4 is a left side elevation view;
FIG. 5 is a top plan view;
FIG. 6 is a bottom plan view; and,
FIG. 7 is a top, front, right side perspective view.
The broken lines in FIGS. 2, 4, 5 and 7 are included for the purpose of illustrating portions of the seat belt connector that form no part of the claimed design.