I have purchased numerous tramps from www.slosail.com I have been extremely pleased with the quality of materials and workmanship. I just recently ordered a set of wing tramps for a H-17 and they arrived at my door within a week of the order. I have found there pricing to be about the best bang for the buck. Hobie factory tramps are about the best made and you would need one if racing in Hobie class races, but they are quite pricey especially for a 1977 Hobie 16.