Unfortunately, very few choices today in gas wall ovens, almost all manufacturers shifted to electric. Being that you have a caloric, you probably have a 27″ wide unit, maybe one with the lower broiler oven. If you do, those are no longer made. But if you have a 24″ there are a few choices, Frigidaire and GE still make them. On the ultra hi-end, Bluestar does then American range and a few Veronas at the mid-level. So you need to check your width and start from there, height will prob be an issue but easier to fill than cut sometimes Here is a good start :