How do I add the rail cover?

A home owner from buckingahm pa says:
I am pretty sure that the 81-149 is my replacement roller but I am not sure if I can understand how I can add the 8' rail cover. If I am going to add the .25 thickness to the existing rail, how will the roller fit over the added thickness?

Also, my exisiting rail is quite worn. Do you think that I can get the entire bottom plate out and get an entire new rail system? Do you sell that?
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Mike from SWISCO responded:
Thank you for contacting us.

If your track is that worn, you may want to try cutting off part of the track and installing the 80-105 Sliding Glass Door Track.
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