Open 5.70 USA

You must have found a solution by now. Since this is a top search result for the question, and in case anyone else might be looking:

I have a 2003 Open 5.70. All the original hardware was Nautos (I've been switching over to Harken as things break). I'm now looking for these rope-core flexible joints and I'm guessing Nautos HPN473 might be the same thing.

:: I purchased a used Open 570 and have now located the
:: vessel in Utah. I'm rigging it for the first sail and
:: the flexible attachment to a rudder broke at the rudder
:: blade. Any ideas where I can find these rubber joiints
:: that slide in to the rudder mount?
::
:: They look like they could be the same flexible joint
:: that Ronstan uses on the tiller sticks.

:: Are they the same?
::
:: Thanks for any information.
::
:: Dee