i think that is all you need..... im not sure though as that is not one of the popular rear shock swaps.... do u already have the shock?? or could you get a 400ex shock like alot of us have??
I don't know on the LTR but the LT400Z/KFX400 rears are interchangeable with the Honda 400ex rears, when used on the Blaster. Though not interchangeable on the 400's due to the bottom mount being different widths.
The TRX450 rear shock doesn't fit as well as the 400's. All I can speak from experience on is the TRX450, 400EX and LTZ/KFX 400's. The 450 reservoir needs more room and I believe are stiffer. The shocks from all 3 of the 400's mount right up with a bushing set and drilling out the bottom mount holes. The opening on the KXF/LTZ is narrower than the 400EX rear shock but the Blaster swingarm mount goes to the outside of the shock.
Yes I did this you have to trim your rear fender mounts and idk if the kor bushing work but I used a wrist pin out of an old piston but u had to drill my frame to make it work