If you ever do end up looking for a replacement, you could consider getting a Supervee Bladerunner Bridge, I had a Chrome one on my old Black Fender Mexican Strat and it did work well, the Sustain Block is made from a light metal that SuperVee call "Sustainium", what makes the Bladerunner Bridge different to most other Strat bridges is that the Bridge pivots on a thin piece of spring-steel rather than a set of 6 screws, there are four screws which are simply used to attach the bridge securely to the body, here's a link to the SuperVee webpage so you can see what the Bladerunner Bridge looks like:
https://www.super-vee.com/products.html