48t Chainrings

My Specialized Source Comp Disc came with 48/34T FSA Omega chainrings. They are sadly now fairly worn and I was looking at replacing them.

I was thinking of sticking with the current gear ratios - seem to work for me. I am often towing a baby and/or carrying lots of stuff. The existing chain rings were fine but I don't mind getting something slightly fancier either if the upgrade is worth it. My problem is that I can't find a compatible 48t chain ring (110mm BCD), even from FSA. I don't know if I'm looking in the wrong places or if technology has just moved on.

Can anyone make any suggestions?

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