[russcc]

Thank you all for your suggestions. The 1/8" compression collar is Not a Standard compression sleeve used in compression fittings that you find in the hardware store. Look at the photo of the brass sleeve on the copper line, and you will see the difference. These sleeves, especially the brass ones for the copper have a long sleeve to minimize chafing at the compression nut, and support the tube where it is most likely to fatigue from vibration. So the questions remains unanswered, where can you find just the compression collars in the photos, either aluminum for the nylon or brass for the copper lines. Thank you.