Don't forget that most Jumbos were not conversions of existing tanks but were built new as M4 A3 E2 standard. However, as far as possible existing designs of components were used so that design and tooling work were minimised. Where it was easy to not drill a hole or weld a piece on (like the provision for the headlight sockets) they took the opportunity but if they were short of a particular piece (the simplified glacis plate here) it might well have been easier to use a standard one to avoid waiting for a delivery. They might easily have had to take part built hull fabrications that were intended to be standard M4A3 off the main production line and finnish them as M4A3E2 hulls.
David
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