First of all thanks for helping me out, I appreciate it.
Would I be correct in assuming that you have replaced the first aid kit with the fire extinguisher? Also what is that black plastic item on top of the triangle on the right hand side?
Finally, a photo without the items in place, showing the pattern of the holes where the Velcro goes through would be a great help, then I could estimate their positions as it might be tricky for you to measure them.
As I have the kit and the triangle already and would like to have them stowed neatly as the UK ones are. My guess is that the first aid kit is a bit old now.
I have a newer kit made by someone else somewhere.
Thanks again for your help.