When I had a Miata, replacing the rain rail was a common part of changing an older convertible top. Do S2000's have a rain rail as well, and should I expect it to need replacing?

 

The S2000 does have a rain rail, but unlike the Miata ones that disintegrate when you remove them, the S2000 one can be reused quite easily. Drill out the 11 rivets that attach it to the old top and rivet it to the new top.