15 base rear bumper to 15 nismo rear (advise from those who done it)
 

I know it's probably been asked 1000 times on this but, all I wanna know is there anything else I need Besides nismo rear bumper and tow cover to convert my base bumper to nismo? I wanna hear it from those who has done this conversion. Please Thank you !!

All I did was take the license plate bracket from base bumper and the two sponge/foam things attached to it onto the Nismo rear and that's it. Didn't need anything else really. I ordered the tow hook cover for it because base tow hook won't fit Nismo rear.

I'm looking to do the exact same thing.

Can I please confirm the part numbers for the following:
2015 NISMO 370Z Rear Bumper - HEM22-6GA0H
2015 NISMO 370Z Rear Tow Hook Cover - 85010-6GA0A

I hear there is something about a problem with fender liners not matching up. Can anyone elaborate on this?

Will it damage the car if we don't address this fender liner issue?

From the Z1Motorsports website:
"The NISMO Rear Fascia will bolt directly to the Non-NISMO 370Z. However the lower fascia retainer bracket will have to be removed. There will also be a gap in the fender liners. In order to properly secure the fascia and to fill the gap in the inner fender liners created by the NISMO rear fascia, you may purchase an optional hardware kit."