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Where to buy the door opener for my garage door?

I have an older Sears garage door, lost the garage door openers. Can I buy a generic one and program it?

Answer:

The best thing to do with that is get the model number of the opener and google it.

Now if you see something about Security+ it means you garage has rolling code. If that is true, you will need to buy one that has the same freq. If it is, there will be a button up on the door motor, mine is orange. You will need to press that button on the motor and the button on the remote to tell the garage door to accept it. They have some nice options, even key chain remotes for like $25.

Now you said it was older, so it may not have that. If there is a series of dip switches on the motor you will need to set the same dipswitchs on the remote. Again you will need to buy the right one for the door opener.