I have had success with their kit on my Merc....easy install..check ebay...might find one at a good price...
Member deepsushi gave me the following email address and this person listed an extension kit for me brand new in box..around $190.00 including shipping charges.
here is the email of the person I got extension from..
cant hurt to drop him an email to see if he has any others for you particular application.
houghdrew@yahoo.com
also private message deepsushi.
-FRED