Bumping this up for new eyes.

We just moved into a house that has an old cooktop. The brand name is no longer on it, but the accompanying oven/broiler is a Roper, so we think the cooktop is possibly a Roper, too. We've looked all over and under but can find NO identifying information. The cooktop is missing two burners, so we need to replace them. I am including a picture in hopes that someone can direct me to the right place!

Thanks in advance!