OEM Aeron Classic Seat Replacement Titanium Smoke Gray S8 Color 3V01 Size B. For Sale Aeron Seat Pan Replacement Size B 3V01 MEDIUM OEM. DON’T ASSUME IF THIS CORRECT CHOICE OF YOUR SEAT. If you’re not sure what Seat Size/Color/Pattern. We can help to get your correct seat and your chair back to working condition again correctly for once.