On
Hellwig's Site the part number for the Front Bar changes according to the number of Leaves in the REAR Spring Stack. The page shows email addresses called customerservice and techsupport, both @hellwigproducts.com or 1-800-HELLWIG (435-5944). Suggest you count the rear spring leaves and include that number in your question. Our E450 has the 11-leaf pack.
I think Hellwig will indicate they didn't update the year models in some cases, but check that too.
SD doesn't stock those bars. Mine, at least, came from the factory in Visalia CA. If you and Hellwig work something out, I'd guess SD could still take your order. Pretty sure Hellwig doesn't sell direct.