Roller or wheel missing on drawer slider

A home owner from Houston, TX says:
One pic shows the slider with roller and the other shows the slider on the other side with missing roller/wheel (close up). I'm wondering if it would be possible to just replace the missing roller instead of the uninstalling both sliders and replacing them -- trying to keep this as simple as possible. Do you have any parts that could work and how can I do this replacement? Need some simple instructions.
Thank you for any guidance and help to a novice!
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Bob from SWISCO responded:

Yes, we may be able to replace the roller for you. Can you give us its diameter? From there, we'll do our best to find what you need. Many thanks. 

A home owner from Houston, TX says:
Diameter looks to be about 7/8" and thickness looks to be about 1/4"? See attached photos for more exact measurement. Not quite sure if it is simply a matter of slipping a new roller over the round "thingy" on the first set of pictures set in the earlier email - it has a bit of a lip on it so can that be done? I feel like if I have to completely remove and replace the sliding parts, it will be a nightmare to have it all line up correctly for the drawer to work. Thank you your advice and help. Appreciate it very much!
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Tom from SWISCO responded:

Thanks, Kristy. Believe it or not, I like to use shower door wheels in these cases. Through some design of fate these parts are well suited to repair these old style drawer tracks. Our 10-109 in particular is a popular choice. This matches your dimensions exactly and I think is the best option in our inventory.

Installing is another issue. You'll have to get creative. Putting these on can be a lot of work, and like you said it can be logistically frustrating. I tend to just drill the new parts on but that may not be ideal for you if you're not too handy. If you aren't comfortable doing that then I would recommend having a professional come out and do it for you.

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