81450001 ($8.99 ea) to order call a dealer toll free 1800hobie49 (or find one on the finder page:
http://www.hobiecat.com/support/dealers/search/The Harken blocks are nice (we've used them for years, but they are more costly) - however the Harken cheek blocks don't work with the hole spacing of the molded inserts on the new PA's, they are designed to only work with the Hobie version blocks. Several people have bought standard kits by mistake and complained about them not being compatible with the PA 12 - but I think now people are learning, and dealers are also getting wise to the fact we have 2 different kits in the catalog - 1 standard kit #72020008 that works on any kayak (with Harken pulleys) and the new PA trolley #72020061 for the new PA's