You'll need even larger ones than that.
1/2 ID plus 1/8 wall (twice), is 3/4. If you're going to stretch it all over a 5/8 barb, then you're at 5/8 + 1/8 *2, so 7/8. Of course the wall won't be 1/8 by the time you stretch it, but otherwise, that's your clamp's required max size.
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