They list two Impact triples on that page, one says 110mm, the other 110/74mm. (One has a sale price, one does not.) I assume both are 110/74 and that one of them they simply forgot to list the smaller ring specification, so yes it would be easy and cheap to buy different chainrings. Looks like a good crankset to me. I am partial to square taper, it is easy to work with and easy to find bottom brackets for it, I would certainly use that one.