Oppsss...forgot to add:
The bigger MLC2 chest armors has indentions on the left side armor specifically for the LED chest lights which Si Rees (Han Hunter)is marketing.....I'm not so sure if its the standard size, but i think it is. I believe he compared all sizes of Fett chest lights & we came about to that measurement.
As you can see, we didnt cut out the indention on the chest lights so that if you have smaller LEDs, then you can cut a smaller pattern....if its bigger, then no problem as well 
The indentions would help you out in positioning your preffered chest lights 
Mardon "MLC"