Side mount brackets for drawer slides

Hello, I am swapping drawers from one cabinet to another using the existing hardware including these brackets, pictured, and 21 5/8" slides. The slides are mounted to the cabinet using these two brackets on each side (one in front and one in the back). Using these brackets, the width is about a 1/4" too much in the new cabinet so the drawer wont fit into the slide/bracket.

These brackets measure 1 and 11/16" both height and width.

Are these brackets available in different sizes? Any other suggestions to gain about a 1/4"?

Thanks Bob!