You probably need these if your burners are old and worn out. I certainly did! These are very simple and easy to install. They're what make it possible to light one burner and have that one light the rest for you.
Pros
Original Part Numbers: 80009949, 80006583, 80010680, 80009028, G413-0004-01. Dimensions: 7 1/4'' X 3/4''.
Cons
The metal used in the burners may be thinner than expected, leading to corrosion and breakdowns