Some of the old style seaway blocks show up on ebay every now and then but I would not waste good money on them. If you want a good car that is easy to cleat and uncleat order Hobie part 1075. It is a swivel cam cleat car that fits in the old track. The blocks for a Hobie 18 do fit the 16 jib track but are way to big for the 16 and they are still hard to uncleat.