When I bought my silver Vintage Speedster in 2015 I was given the paint code of PPG crystal silver poly #DBU35136. Unfortunately, what came back from the paint supplier was too dark. I had to do a few custom mixes, the best of which is Valspar 6926. Good luck.
NAPA and most auto body supply houses have a computerized hand held camera that will actually "read" your paint on the car and come up with a perfect factory color match or generate a paint formula fora match I have done this countless times.