The Original model ID is what you want to replace and the new object is what you want to replace it with.

Each island has it's own obects. look in the drop down list and replace those that are in the island you want new objects. replacing staunton objects won't make ANY dfference if you are in portland.

Original model ID: Find out what the original model ID is here

Find out what the new objects are here (for Staunton Island only)

Make object invisible
Use this if you want to use one of the
objects as an invisible wall!
 
OBJECTS SIZE
X(width)

Y(lenght):

Z(height):

please enter some values...

Thanks to matt420bad for finding how to do this.
Big thanks to Mythos(Spielmann) for helping me making this (he did atleast as much as me)
Thanks to Coolv for hosting this for me!