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Alex will move the thread where it needs to be, no worries.
As to which side to mount the cans? It don't matter as long as there is no clearance issues, everything is straight and sealed as designed. But common sense tells me to mount stuff on the inside when possible to minimize wind drag. I know it's a little thing, but a bunch of little things turn into a big thing.
Someone who still has a pregen with the stock cans will chime in with the "factory" mounting soon enough I am sure.