Track Replacement Parts - Aluminum Sliding Glass Door

Any one out "there" know of a supplier for replacing aluminum door frame parts, i.e., the bottom door track. Unfortunately, we can't locate the brand of the door, but it looks like a standard track with the rollers running on a center rail which is missing a piece just shy of the middle of the track.
There is a similar, though smaller track to the interior for the Screen.

This is definitely an older home, for a long-time friend of the family. At one time, to make it more energy efficient, because of the wall thickness of the bricked home, they installed an additional aluminum sliding door unit on the outside of this original. I don't think I've seen that done previously, at least personally.

 

A glass shop will have a stainless steel "snap cap" which will snap over the guide that the rollers run on, but replacing the entire sill??

Personally, I would replace the entire slider with an energy efficient one -- vinyl, low-E glass, Energy Star rating, ...

 

Thank's Lefty,

Hadn't thought of that option! Just wonder if it will be strong enough to last awhile. And yes, "cutting" out the existing track wasn't something I was looking forward too, because normally, it is part of the whole surrounding frame.

Per replacing "both" door units with one new energy efficient one [I use Pella a whole lot out here, because I actually get enough of a discount, that the others just don't compete for the quality, and the "service" [if required] is great.

Yes, we discussed the possibility of having to do that. But, this gentleman is in his early eighties, wasn't supposed to have lived this last 20 years, but out-lived his wife by a long shot.