MK5 double pin locker 20 mm fits: Carbon MONO 160-220 and 180-240. 
MK5 double pin locker 25 mm fits: Alu MONO HD 180-240 and 200-250.  
MK7 double pin locker fits: Carbon MONO 200-250 and 250-300.
MK8 double pin locker black for: Aluminium Slim 140-190, 160-210 - Aluminium HD 180-230, 200-250
*Also compatible with most Aeron, Severne, Goya, 211, RDD, Gaastra, Simmer, Prolimit, KA and Naish booms.