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According to that CPL number, those are factory turbos, not a retrofit. That number comes up as a Cummins BCII Turbo. I can't find any real info on it though. But at least it should help that they aren't retrofitted turbos.
Jim
See if you can find any data plates on the engines themselves. The paint on those trucks look like they could have been fleet trucks. If so, its not uncommon for fleets to be repowered to update the trucks. Only engine data plates will tell for sure.
Jim