I have never seen this head , but I would assume it is the same physical size as the D style geometrics . I have all D style heads here . The difference with the chasers are D style have slots to mount in the head . The K style has pins . I'll post a pic of the difference in the chasers . I can find lots of information but haven't seen one available anywhere . FWIW , I bought a large box of chasers up at Cabin Fever . On the top were a few D style sets . On the bottom were a 100 or so K style sets .