Feathercraft closed in 2016 or so, and this rudder is no longer made. All Seda stock has been sold but the product information may be helpful in finding an alternate

The Feathercraft K1 is one of the best rudders in the industry.  It provides a foiled blade for maximum efficiency, easy deployment/retraction via cord and is made of robust anodized aluminum.  This replacement rudder head for Seda kayaks is a single rudder for end-pour mounted boats (Seda does not use a bracket)

Note, this is not a rudder kit for adding a rudder to a kayak, it is the replacement part for a kayak which already has a rudder installed.

Specifications:

Mounting pin: 3/8OD x 2 13/16"L.

Fin: 3" wide x 20" Long