I have for sale, two automotive headrests that can be easily made into a backrest for a Burgman 400. Simply heat and bend the metal posts 90 degrees and they will slide right into the existing holes for the removed butt rest on a 400. I had put over 15,000 miles on my 2008 Burgman 400 and having a backrest was the difference between night and day. I could easily ride all day.
I had purchased three of these and used one on my 400, so now I have the other two to sell.

Selling the remaining two headrests for $25 for the pair plus shipping. They are in excellent condition.

(I do not have PayPal, but am okay with a personal check, bank check or a money order)