1931 Model 20 exhaust valve

After pulling the head off ,the first thing i noticed was the 2 different sizes of valves.

The intake is still original at stem length 4" stem dia 3/8 . Head dia 1.85 and the valve has sunk into the head a bit. so new seat required.

The exhaust valve sits way down in the head and I suspect that's why the decomp assembly was removed as the rocker arm would hit it.

the replaced valve exhaust stem length is 4", Stem Dia 3/8 but the head dia is 1.73,just a tad smaller.

I've tried the regular shops online but all the OHV valves are 4 3/8 long with a head of just under 1 3/4

Does anyone make these correct 1.85 Dia valves ?