Those Swiftech blocks have John Guest push-in fittings.
You can get push-in-to-barb fittings (1/2" push-in to barb for 1/2" ID tubing). If bigfoot doesn't have 'em, you can get them from swiftech, mcmaster-carr or usplastic (probably lots of other places, too - those are just the ones I know about.)
Or... you can use short lengths of 1/2" OD copper tubing. Push it into the push-in fitting, push the flexible tubing over the copper. Your local hardware store should have this. . If you want to get really fancy, go to your local radiator shop and have them set up a couple of short lengths of 1/2" OD copper tubing for you - they can use a "beader" to put a "bead" in the end that the flexible hosing is going to go over - works like a barb, only better.
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