looks like the one i have (400ex)...but that one will work great
you bought the wrong shock 03 z400 shock is garbage, you need a 05 and up ltz 400 shock,
i had a 03 400 it was a pogo stick, they revalved them in 05 , the 05 are alot better. go on suzuki central ask for a 03 shock they will give it to for free.
i would not worry about it. i imagine that it is better than stock- hell a stick up your ass is probably better than stock! anyways, if you do not like it you could always get it revalved for like less than $400 and then it will be like an aftermarket shock.
lol 400 to get it revalved or 50 for an 05 shock? I'm not to terribly worried about it, i never really had a problem with stock, i just wanted something slightly better and something that would raise it up a bit.