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Kevin I have had no tambour replacement experience. I will have to replace all of mine in the Airstream. It is hardboard with a laminated veneer giving it a walnut look. the width is 7/16 at widest (back) tapered or chamfered of course to 5/16 inch at face.The width is 1/8th inch as best Ican tell without calipers.

Some where on an A/S site I saw that there is a 3/8 (perhaps nominally) and a 1/2 inch tambour used in Airstreams and/or Argosys.

I will bet that the metallic is also a veneered strip of metal over a hardboard or real wood backing. I know there is also a mirror tambour available.

What I don't know is whether the coils that recieve the opened tambour will accomodate both the widths. Actually the width difference would only be a factor in the turnability of the tambour in the coil channels. The overall width difference would be omitted I suppose. The thickness of course is probably critical to prevent binding in the channels of coil.

I hope to be able to use decorative (3-hump) white pine (window)screen moulding as my tambour stock. However if I recall the width is close to 11/16ths and I don't know about the thickness. If that wont work perhaps there are some profiles of decorative cabinet face mouldings that might.However the screen moulding is so much better priced.
Wish me luck, and much of the same to you.