Hi Dick,
The letters "W" & "H" in the model number is just a color identifiers. "W" - white and "N" - almond.
According to the information I found Whirlpool redesigned the gas valve for this dryer together with new style of coil due to safety issue., what means you have to replace the whole gas valve & burner assembly.
- The part number for the gas valve & burner assembly is
AP3094285
Here are the break down diagrams for the Whirlpool dryer
Model LHI7501W0
Gene.
P.S. Because of price for the part your decision should be based on the condition of the dryer.