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Only the classic shape STIs really had version numbers.
A 99 reg car will probably be a phase 2 engine and facelift interior (popup compartment on top of dash) and exterior (revised front end and rear bumper).
Parts from 99 - 01 should fit. Post up a pic of the car if you want clarification!
if its a 99 uk car then it wont actually have a version number, however its quite common to be given one. Its sti brother would be a version 5 in that year.