a 38~39 /48 will work as well as a 42 /52 and I agree Sugino chainrings would be least cost, new,
though Vuelta and Salsa thru QBP are good too,
7xxx a bit harder alloy..

and there are also Surly Stainless chainrings long wearing ..
made for single speeds but will work on older derailleur bikes too .
as long as your expectation for instantaneous shifting is realistic, as it must be..
.... patience, grasshopper ...

an alloy outer and steel inner may be ideal ,
as most people ride a lot on the inner chainring ..
at modest speeds and efforts.