I cant help with your question.
But if you have the non ABS version, and/or have a Lithium battery, you should have some space under the seat, i would try to get the reservoir in there.
Most people seem to bolt the pre load adjuster to one of the hole for the passenger foot pegs.
Im sure Elka design the shock with the placement for those in mind, you should send them an email.
"The ZX-10R is capable of being perfectly docile and tractable, but few men are capable of resisting its ever-present voice urging them to just twist it and see what happens."