Anyways, if you don't have a copy of the Owner's Manual, try to contact their Parts Service. The 800 number is in the phone book under 'Sears'. If you still don't have any luck, post back and we'll see if someone on the Forum has your particular opener and can make a copy of the Manual. It sounds like that's all you need.
My best to ya and hope this helps.
PS: IF you post back, be sure to see if your Post is getting 'buried' on the Forum. If it is, create a new post. Then, tell 'us' what you've done and what you have so we know not to double-advise you on this.