I don't know what your original ratings are, but you likely have a 5000 lb. trailer with 2500 lb. axles. This site has a detailed table
Trailer Double Eye Springs at the bottom of the page. Sorry it's Canadian, but that's why I'm familiar with it. These parts are the same on both sides of the border anyway. Try a similar trailer supplier in your area as opposed to an RV dealer as well.
A good spring shop should be able to make up a spring for you or they may replace just the leaf. You might also think about changing springs on both sides of the same axle.
Henry