Don't worry about this point - all antifreeze sold today is non-silicate. Check the labels to convince yourself. Save some money and don't get the overpriced Honda stuff.
You also will want to replace those elbows. They are made of pot metal and a number of repairs to hoses, where the elbows weren't replaced, ended soon after with cracked elbows. Elbows, o-rings and the two hoses. The water pipe seal seems to be less of a concern, but since you are in there, do it too.
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