mate that entire kit is less than the genuine z tune front bar so no, there is no chance at all that its a genuine kit. also east bear is more expensive than your kit
http://www.rhdjapan.com/nissan/r34-skyline-gt-r/bumpers
refer to the above link to see how much genuine kits will cost you.
for example, my abflug rear diffuser alone was $1600, but the fit in 100% perfect, not a single tiny gap can be found anywhere.
Im not trying to put u off buying the kit im just letting u know not to expect a good fitting kit as price normally reflects quality