The ornamental design for side mounting suspenders with belt attachment clips, as shown and described.
FIG. 1 is a front perspective view of side mounting suspenders with belt attachment clips showing my new design;
FIG. 2 is a right side view of the suspenders with the left side view being a mirror image of the right side view;
FIG. 3 is a front perspective view of suspenders illustrating my new design;
FIG. 4 is a back perspective view of suspenders illustrating my new design;
FIG. 5 is front view of the suspenders; and,
FIG. 6 is a back view of the suspenders.
The broken line showing of a shirt, belt and trousers shown in FIGS. 1 and 2 is included for the purpose of showing the environment of the side mounting suspenders with belt attachment clips and forms no part of the claimed design.