Replacement sliding door rollers

A home owner from Northfield, Maine says:
I am looking for 2 replacement rollers for our sliding glass door. I'm hoping these pictures are enough to go by. The door is approximately 30 years old. I hope this is all your need.3
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Paul from SWISCO responded:

Your roller looks close to our 81-011 patio door roller. However, in order for you to confirm it, you would need to remove the part from the door to compare your measurements with ours. 

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