Product review (4 stars): they seem to be working just fine. They are reasonably priced so you don't have ...
I have an old gas stove and have been cutting aluminum foil to cover the drip pans.  These are much sturdier than regular foil.  Although these don't fit over the rim of the drip pans, they seem to be working just fine.  They are reasonably priced so you don't have to feel bad about pitching them when they become too soiled to clean.  Similar products I have found in the past have been outrageously priced.