I have an older frigidaire crown series oven, I cannot get the 2 front burners to kick the ignitors on using only the dial for that specific burner, but when I use any of the back ones, I do see that the ignitors are sparking for the front ones, which wont work with their dials, please help? also any idea where i can find the 2 knobs for the oven control temps that go on the top panel, I’ve scrubbed the words and temperatures off them…