I might need to replace mine as well and picked this site up- not sure of the measurement:
https://www.progressiveautomations.com/products/mini-linear-actuator?variant=18277278646339
Hey Folks - sorry for the long post. New 04 420DA owner moved up from a 34DA. In part because of you all and all the great info you post!
I was looking at threads for answers on a problem and found an old thread #2617 (http://www.clubsearay.com/index.php?threads/420-da-thread.1273/page-131)...
You might look at Vitrifrigo (sp) defender marine was where I got it and seemed decent but sold that boat and need to replace both fridge and freezer on my 420-just googled it...
Running 8.1's on a 2002 340 SD 700 hours. Don't bring it up 3800 -4200 rpms very often and did and noticed the starboard engine tack bouncing and felt an intermittent power back off. Its not noticed at 3000 0r 3200rpms or at any speed. Changed the fuel fliter, have been treating the gas...
Just replaced shaft seals on my 2002 a real pain. The Tides (blue bellow hose) is a real bad design metal on metal. Wore the shaft a bit. Went with the PSS carbon seals and was able to get by the grove in the shaft. Pretty tough job, consider taking the engines out if the old seals show any drips...
Its a lot easier if you take out the exhuast system and the mounting bracket then you can get int here and work. Tried to do it first without removal and they are just to far down under...