Tiara 3000 Open salon berth

[Flatliner]

Hi everybody. 
Wondering if anyone that is familiar with the 3000 Open (mine's a 2007) has any information on where I could get (or the dimensions to make) a filler cushion for the salon U-shaped settee that allows it to become a berth? Is it stowed elsewhere in the salon? There's a pull out board underneath the forward portion of the settee on the starboard side but I can't seem to find the filler cushion. I've attached a picture of what I'm talking about.

Thanks in advance!