Here's what we supplied and fitted to Marks Zed - http://www.350z-uk.com/topic/70975-so-bm-went-to-leicester/
Drop us a PM if we can help with the ARB and drop links...
We don't sell cheap spacers, only trusted, quality Eibach spacers, tried and tested for years - http://cougarstore.co.uk/index.php?main_page=product_info&cPath=1_18&products_id=169
The offsets are weak for a 350z and in their standard guise they might not clear the Brembos, a 25mm spacer will help as it will bring the offsets down to 15...
Any photos of the system, some stamp their exhaust tips with their logo and there should also be plaques on the mid pipes and sometimes on the Y's too...
How about a set of Rota Grids from us - http://www.350z-uk.com/topic/56120-rota-grid-wheels-19â€-–-new-colour-options…/
Or the GTR - http://www.350z-uk.com/topic/32711-rota-gtr-wheels-–-350z-fitment-from-cougar-store/
Drop us a PM if we can help...