Aluminum Sliding Door Roller

A handy person from Boise Idaho says:

The door is from 1975. I'm looking for two sets.

The wheels are 1 1/4" diameter and 3/8'' wide. The screw holes are 7/8" apart. If this unit can't be found, should I drill out the wheels and replace? If so, what wheel replacements should I use?

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Tom from SWISCO responded:

Hello! This looks very much like our 81-077 at first glance. Look it over and let me know if you agree!

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