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It's common to use 1/4" quick disconnect barbs and flange connectors (as shown in your photo) with a 5/8" gas hose. Just be sure to use either a worm clamp or oeteker clamp on the hose to keep it in place on the barb. Alternatively, you can get 5/8" barbs for the flange connector, but I'm not sure it's necessary.
Without knowing 100% what is available near you (saw that you are from the states which seems like a place where you can get almost anything from your local shop) there are hose-adapaters that you can buy, these are how they look in Sweden; Slangadapter. EDIT: After doing a bit of digging I found that they are typcally called 'Union Reducers' and can be ...
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