I've had both bumpers off the EC. Front to install a nudge bar and LED lighter and rear to install a tow bar. The process is not listed in the online manuals unfortunately but it gives you an idea of the fastener layout. Both products I installed were genuine Mitsi parts and came with a detailed installation sheets. Unfortunately, these went in the bin after the install.
The process is easy with these instructions but not so without as the disassembly sequence requires popping delicate snap fittings on both bumpers than can break if you do them in the wrong order. Try a google search for the instructions on the web is may only suggestion. Good luck.
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