I have a basically new 2016 ESA rear shock for an F800GS or F800GSA for sale with less than 200 miles on it. It came off of my 2016 F800GSA. Plug and play for ESA prepared bikes. Works with Non-ESA bikes as well, just with no damping adjustment. BMW list pricing: P/N: 33 54 8 522 113 SPRING STRUT, ESA, REAR $1978.09 Asking $350 shipped lower 48.