Custom towing mirror extensions, slide over existing mirrors. Not sure the exact fix.
The box is for a different set but I think that the mirrors will
Fit: 1988-2000 Chevy/GMC Full-Size C/K Pickups; 1992-1999 Chevy/GMC Suburban, Yukon, Kodiak; 1992-1999 Chevy/GMC Tahoe, Dually; 1991-2004 Chevy/GMC Safari, Astro; 1992-1999 Cadillac Escalade