Just got a set of Hagons for my 1977 750K.Just google Hagon USA and give them a call.They are very knowledgeable and helful with the set up.They'll ask how you ride,1 up 2 up,weight etc.....Then help you select the shock,you buy direct from them,I didn't have a problem and the bike rides much better than with the 35 yr old stock shocks that were on it. Definitely the way to go.