Front burners won't light

hi there,
I have two issues I’d like to get some help with.

1)My front two burners on my stove need to be lit by hand. I’m thinking I need to replace the ignitors.
2)It’s a bit corroded under the hood, and on one of the burners the heads of the mount screws have corroded right off so the burner tends to sink right down. It’s kind of rigged right now, but if I’m gonna fix this thing I might as well do it right.

Thanks for your help,
telly:eek::D:o