Well they are complete morons and idiots. The Z1 will fit just fine in the Z, thats what I'm driving now and I know several folks that have it in there.
I'm not sure if links are allowed here or not, so if this gets edited drop me a PM. Check out my350z.com, under the modifications forum they have one for audio. Great Z forum.
Heres a couple links with pics that I found by searching there:
http://www.my350z.com/forum/showthread. ... ht=avic-z1
http://www.my350z.com/forum/showthread. ... ht=avic-z1