@swatski so here is a little more detail on the hatch cover cushion installation.
First. Find where the (4)mounting bolts are located. For those with stock insulation, its as easy as feeling around until you find them. For those that have done sound deadening upgrades, I have attached a few pictures to help you.
First measure down 4 1/2" and place a mark.
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Then measure over 3" and that is the center of the upper right bolt
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Do the same for the upper left bolt. Exact same measurement. The bottom (2) bolts are exactly 14" c to c from the top bolts.
Once the 4 bolts are located you will need to remove the factory hardware. The instructions say to cut a 1/2" hole in the insulation to do this. I simply cut a small slit and worked through that. Obviously, if you have added insulation then you will need to cut a hole through it. Instructions say to use a 11mm socket but this is an uncommon size in deepwell so a 7/16" will work. Must use a deepwell. The seat is held on with a 1" fender washer and a lock washer and nut.
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Once all the hardware is removed, you can simply remove the factory cushion.
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Once removed, get out your favorite heavy duty cleaners. My boat stays covered and it was still nasty!
Now its time to install the split cushions. This is fairly straightforward as each cushion is marked.
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Simply install each cushion with the supplied hardware. Ensure that the cushion is sitting flush with the engine hatch. Note the lock nuts in the above picture. These need to sit down inside the factory holes.
Next its time to install the anti slip between the two cushions. Its not too clear, but you can see there is an outline already so just use this as a guide.
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And your almost finished. Lastly install the small strap snap in the engine hatch. This I haven't done yet. Below are a few pictures of what you can expect. I did have a lenghty discussion with Will about the design of the center cushion. You will notice it is not constructed the same as the two outer cushions. This causes a height variation between the three cushions.
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For me, this install was a no brainer. I couldn't stand stepping on my seats and knew over time this would damage the seat, plus a seat provides a very unstable platform for those who are a little older. Hope this helps