Metal Rails - reclining for Sun/Deck Chair

I am building an outdoor bench along my deck using deckboards - 7m x 1metre. Rather than have one long bench that will be about 500mm above the deck - I would like to to divide up the bench into 2 sections that can function as a reclining sunbed. I am looking for metal rails that come configured with different reclining positions that I can use. There will be an hinge of some sort. Preferably, I am looking for some commercial solution without having to make the reclining mechanism myself from timber.

Idea that I have is similar to those plastic sunbeds that have adjustments for reclining positions

Any suggestions welcome and where I could buy rails from.

Thanks

Might be an idea to try nautical supplies places ie: businesses that build or fit boats out