A: Thank you for your inquiry. You would need a 5/8" fastening nut.
A: Thank you for your inquiry. Our Silver-162 would be a color match to Sterling Silver.
A: The lightest Grey.
A: Thank you for taking the time to share your feedback. We are sorry to learn the seat was missing hardware and we regret any inconvenience it has caused. Please contact our friendly customer service at 1-888-722-6488 to request a new hardware for your seat. Your Case number is 00175134. We take a pride in manufacturing quality products and we look forward to hearing from you.