None of the above will work w/o mods. I put 350x shock on my sx(had to modify lower bracket on shock to make it work) and it rode rougher than ever! "x" shocks are made to be mounted at an angle(guessing around 45 degrees,where sx are more straight up and down, maybe 10 degrees,again guessing. I'm going to try welding a bracket on top of rear axle housing sometime to see if it will work. That will put shock at closer to same angle as on 350x. You must also watch raising rear of machine as might cause excessive wear on universal. So far as I know a custom shock is only option for us sx'ers now(w/o alot of mods).
My .02
Al
TF03/HASPIN ACRES /BADLANDS SURVIVOR!!! -LIFE IS GOOD!!
'86 350x (latest addition)
'85 250sx-200x frt.end,350x bars,plastic tank,3"hub spacers,22x11x10 Fast-Trekkers/.190 Douglas Red Label alum. rims/PRM desert grab bar
'85 250sx(supertrap exhaust,chrome rims)
'87 200x(restored)-'85 200x-'84 200x