I just checked the box that mine came in and the part number listed is 77 10 8 546 078. They were ?84.00 and also came supplied with HP Paddock Stand Adapters. If you want the non-HP branded version from Gilles they are sold as AXB chain adjusters at a lower price and are available from Calsport.
For future reference here is a link to the BMW Accessories Brochure which contains pictures, part numbers and prices for all the genuine accessories for the 2015/16 S1000RR.