I also have a 2016 2504s.
Just pulled and repacked all my axels this weekend only to discover Dexter uses Chinese made bearings...... Ordered four sets of USA made Timken bearings and cups to replace. You will also need seals for each hub if you intend on replacing the bearings.
Dexter recommends repacking your axels every 12months/12,000miles.
Axel Bearings (Are replaced in sets of a cone and cup)
Cone Cup A. DIA B. DIA C. WIDTH
L44649 L44610 1.0625" 1.9800" 0.5600"
or.......
L68149 L68111 1.3775" 2.3612" 0.6250"
If you intend to replace your bearings you will also need seals. The correct seal part number for the EZ-Lube axles is (010-019-00) or the kit # K71-303-00 with two seals.
Dexter bearing repack video. Easy afternoon job with the right tools.