I do not know if a glass bowl was still used on the fuel side (top side) of a dual-action fuel pump in 1958. The style supposedly changed in 1958.
Here is a photo of a 1957 dual-action fuel pump with no glass bowl on the top side (the fuel pump side). It looks like the difference between the 57 and 58 dual-action fuel pump is the diameter of the two vacuum holes/ports on the bottom half of the pump.
