Try this site:
Parts & Accessories | Shop & Find Lawn & Garden, Appliance Parts at Sears Parts Direct | SearsPartsDirect.com from Sears
thought ti was more like www3.sears.com but didn't work
Some Sears If you hold the learn for lomger, it erases all codes.
then pregram new codes. Eleminates old or lost(stolen) remotes.
Check procedure first, but may be press learn til it lights, press and hold remote till flashes, repeat for additional remotes. What model do you have?
Chamberlain, If I remember right has good info on your operator.