what i was trying to accomplish was using the newer 91 92 shock because the seals were good so i tried to put my 89 head on the newer shock and just not have that adjustment  on the end ! failed to accomplish , so i am trying to use the 89 shock with original head canister etc. i am going to send my shock out to be rebuilt but now i need these two pieces to go back to original ,shock company said they could not locate the pieces. i know nothing about these shocks and was experimenting and failed . the shock is the older one i need the gear and adjustment bar for .