BTW: I decided to change the title of this thread and move it since it's turning out to be a general Slash upgrade thread...
Here is a pic showing the differences between the stock hinge and hinge from the FLM tranny. You can clearly see the FLM hinge is longer by about 1mm:
This pic shows how much material needs to be removed from the RPM arms to allow them to work with the FLM hinges. Note: RPM arms work fine as-is when using the stock hinge/tranny:
