1” pitless handle could still be 1.25” pipe below. Gauge reads 4 PSI high, so pressure switch is still 40/60. Can’t get taller tank with same OD as that WX203. But you could replace it with a PK1A or PK1W Pside-Kick that will reduce the cycling of the pump even though it uses a smaller, 4.5 gallon tank. Cycling is what caused the wear the pump has now, and also what is causing the breaker to pop when running a sprinkler.
½ HP, 10 GPM, 2 wire pumps are a dime a dozen. Even box store brands won’t be much different than any others. Your not going to find any of them that are made to last 19 years any more. Just have to reduce the cycling to make them last as long as possible.