Up for sale is the perfect solution for mounting your ecm when doing a LS swap!! 

This mount is cut from 14g plate so it's nice and solid!! It uses the four existing screws that attach the cover to the ecm and has mounts for attaching to a flat surface!! It is roughly 2.75" tall which puts the ecm just above the mounting surface!! If you need one a little taller or need one side taller than the other I can build you one to suit your needs!! If you want we can also change the ovals on the end to something else!! Just send me a msg and we can work out the details!!

Thank you for looking and good luck!!!