I'm currently building an M10 from Academy for the sherman campain with some extra details and i want to add the trunk of the deep wading kit as we can see in this picture

But i can't find any info/plan/measure, only small pictures over the net, in my documentation or Armorama
Anyone know where to find some good ressource to build this trunk, if they are unique or chain-produced or if they are the same as those from the M4A2
It's the third kit since my return in the hobby, and now that i tested a lot of techniques i learn from this site i want to add a little more ^^
Thanks in advance