Spec the sink alongside the countertop and one supplier covers the whole top - nine undermount models across kitchen and bath, in 18-gauge SUS304 stainless and AA-grade porcelain, sized for standard cabinets. ADA-compliant bowls are available on request. Verify cutout dimensions before fabrication.
Sinks come off the same owned supply chain as the countertops and deploy on the same schedule - no chasing a second vendor for the cutout that holds the job up.