I just order a whole bunch of these things from McMaster Carr. Depending on the OD, Outside Diameter of your tubing, I used McMaster P/N 52545K52 to support my 1/4" line which has an OD of 0.500". Fits perfect!
Measure your tubing then match that to the range specified on McMaster's site. They only have about 50 sizes to choose from.
Good luck!
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