Here is a vintage Jenn Air Oven Door handle.  Don't be fooled, this is used but still in great condition and it's straight!

This style of handle reaches across 30" and mounts to the outside edges of the oven door.  This is unique to early models like the 88168, 88169, 88170, 88368, 88369, 88370 and more.  You can quickly tell as most handles are mounted to the glass.  I'm sure there are some wall oven models this would fit too.  In a pinch, you probably could retrofit any 30" door with this but you'd have to tap some screw holes in.

PLEASE measure first to make sure this fits your model.