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The picture is of a TM window I found online. It shows the metal piece at the end of the window
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OK, knowing that, I took another long look at the picture. Are you referring to the straight white vertical piece, near but not quite touching the curtain in the picture? The photo looks like the window is bent back beyond that piece (closer to the curtain), and I have no idea what that is about. But if you don't need anything in the "bent" area, you may be in luck.
Assuming that is true, the piece is a length of simple aluminum extrusion. If you do a Google search on "aluminum extrusion" you will get a ton of hits. Extrusion comes in all kinds of sizes and shapes, so you would need to measure the missing piece carefully (I know, how do you measure a piece that is missing?) and find something that matches. You will have to buy a piece that is longer than you need, and cut it to length yourself - no big deal. And it may be bare unpainted aluminum, and you would have to paint it. Also no big deal. The good news is that the stuff is wicked cheap.
You will need to make two critical measurements. Most important, how wide does the groove in the extrusion have to be. The edge of the glass has to slide into the groove, so the width of the groove has to accommodate the thickness of the glass, plus a bit to accept a thin wrap of rubber strip around the edge of the glass, to water-proof it. You will also have to provide this rubber strip. Second is the depth of the groove - in other words, how far will the glass slide into the groove.
If you look carefully at the other windows in your camper, you should be able to get a good idea of both measurements.
When you put it all together, you will need to glue the rubber strip onto the glass, and also glue the rubber strip to the inside of the aluminum channel, so that the aluminum piece doesn't pop off when you pull it to open the window. Slow-setting super-glue might do the job and give you some time to work with it - I'm not sure. Or buy some glue labelled "bonds rubber to metal and glass".
Good luck.
Bill