The Harley approved repair is to replace the caliper. They do not sell the pistons, seals, boots, or transfer port oring. Just new loaded calipers.
That introduces the issue of unbalancing the front brakes. New caliper on one side, old caliper on the other. And needing differing amounts of pressure to make the pistons move. The new caliper may need less pressure to apply the pad to the rotor. But the old caliper may not retract the pad completely away from the rotor. That's why on dual disk, what you do to one side you also do to the other side. But I seriously doubt an insurance company will see it that way. To be sure, you will want to make sure the pads do not get mixed.
Past that, get your old parts back. Its not that expensive to rebuild that old caliper. And be sure to report it to NHTSA. Its becoming a fairly common issue on bikes with a few years on them.