Product review (5 stars): exact replacement part.
My drier was not heating. The ignitor is the first thing you should replace. My problem was more than the ignitor, as the ignitor was not burned out, but not as bright.

Turns out I had a bad gas coil ( the 2 black electrical parts on the gas regulator) My ignitor lit, but the valves did not open. Luckily I ordered the valve coils also. for a few dollars, it was well worth the insurance.