The Harkin cleats are pretty close to the original seaways but work much better I think. I've also used the Ronstan and have been very pleased. I would go ahead and replace both cleats. You can always incorporate them into a remote jib traveler system later, so you never really outgrow their use.

Just find another dealer. I've used an out of town dealer that mails me my order. Also, Murrays carries a complete line of Hobie parts if you ask for them.