USED Vintage O'Keefe & Merritt Gas Stove 8.5" Oven Door Spring (works with the spring, cable & hook/rod system) These are a good used spring with good tension. If you don't feel you need a new spring, this may be a good alternative. 

If your stove oven door uses the hook, cable and spring system, this is the "spring" part of the system for one side of your oven door. It attaches to the underside of your stove. Each oven door has two springs. For proper door function it is a good idea to replace both springs to maintain equal and proper tension. This will also help prevent panel & knob browning.