Oven wouldn't heat

Although the original oven design called for a round igniter, the most recent replacement, done by a service mechanic, utilized a flat igniter. I compared the appearance of this flat igniter to the igniters offered by PartSelect and found that the GE igniter (not the Roper which cost twice as much) matched exactly. I installed it and that solved the problem (of insufficient igniter heat to turn on the gas).