TAMIYA MFU

[OZZY HILLBILLY]

G'day Guys
Back to pick your brains, Can a Multi function unit be installed after the truck has been built .
What the deal is I built a king hauler for my wife years ago, now after a visit to a mates house who is truck mad she brought 2x MFUs and gave me the task of fitting one to a already built truck when they arrive, but for the life of me I cant remember if the light lenses are glued in (I think they are though) so when installing the unit do you need to remove the light lens and fit the wire through the hole or can they be fitted from behind. At this stage the MFU's after in transit so I don't know what I'm dealing with yet so just looking for a heads up before I sit down to the task.
thanks Brad