stub axle on Z1 website

[Zilver]

Hi all. I really need some help here and would really appreciate it...

I bought wavetrac diff from Z1. Their website says my vlsd needs a right side stub axle replacement so they actually sent me part 38220-1NC1A/JK01A.

the Z1 instructions:
https://www.z1motorsports.com/differ...sd-p-9675.html

what the axle looks like:
https://cdn.z1motorsports.com/imageG...etailsHalf.jpg

On the other hand wavetrac official website says
"370Z with OEM viscous LSD must replace RH axle flange with Nissan #38220-JK01B (1 req) to install Wavetrac."

source:
Wavetrac® Differentials - Application List

I went to mechanic and he said the 38220-1NC1A/JK01A is too long so I suspect Z1 has printed the wrong info and sent me the wrong part? Has anyone got this issue and whether I need to return this axle and get 38220-JK01B instead?

I have uploaded screenshot highlighting Z1's instructions as well.

Regards