Here is a vintage Jenn Air Oven Door Inner Glass Pack.  Don't be fooled, this is used but still in good condition...and one piece! I will point out under the right lighting, you will still see some spots and light scratches. This should fit a handful of the S-series downdraft ranges as it measures 16" x 7" x 1 1/2"

If you can turn a screw driver, you can replace this glass on your oven door.

PLEASE measure first to make sure this fits your model.