Abstract: A seat adapter for a mobility assist vehicle includes a top member that defines mounting locations thereon sized to receive an OEM seat mount for an OEM seat of the mobility assist vehicle. A right side member mounted to a lower surface of the top member extends generally downwardly from the lower surface and defines at least one mounting location thereon to allow the right side member to be mounted to a floor tub assembly of the mobility assist vehicle. A left side member mounted to the lower surface extends generally downwardly from the lower surface of the top member in spaced-apart relation to the right side member. The left side member defines at least one mounting location thereon to allow the left side member to be mounted to the floor tub assembly.