Milodon used to make stock replacement pans with slightly more capacity and much thicker metal and reinforced corners. I seem to remember 6 Litres was the standard capacity of their aftermarket stock replacement pans, great quality and nice gold finish too.
They weren't that expensive compared to factory replacement pans either, check em out.
“She may not look like much, but she's got it where it counts, kid. I've made a lot of special modifications myself.”
— Han Solo