The ornamental design for a seatbeltstrapattachment, as shown and described.
FIG. 1 is a perspective view of the seatbelt strap attachment of the present invention;
FIG. 2 is a front view of the seatbelt strap attachment of FIG. 1;
FIG. 3 is a rear view of the seatbelt strap attachment of FIG. 1;
FIG. 4 is a left side view of the seatbelt strap attachment of FIG. 1;
FIG. 5 is a right side view of the seatbelt strap attachment of FIG. 1;
FIG. 6 is a top view of the seatbelt strap attachment of FIG. 1;
FIG. 7 is a bottom view of the seatbelt strap attachment of FIG. 1; and,
FIG. 8 is a perspective view of the seatbelt strap attachment in a position of use.
The evenly spaced broken lines on the claimed surface in FIGS. 1, 2 and 8 represent stitching. The dot-dash lines showing a portion of a human torso and seat belt, form no part of the claim.