We currently don't make parts for the steel frames. I like the aluminum frame because it has a bigger tank. Steel is cheaper in cost so I think they like selling those. I know they show the 1903 on their website, but check with any dealers to see if they are available any more. Motostrano sells a lot of Felt bikes on the internet.
Seems all they have in the original aluminum tank style is the do it yourself "canvas" kit Glad I got my Twin when I did.