Cheers man, I spoke to rusty lees earlier today about possibly raising one up slightly. Because of an under seat sub enclosure. They have stock but also mentioned about buying from eBay as it's free postage. ( I think this route is via skyline).
I'm preferring this design over the others as I've not found any negative feedback about them with regards rattles or wobbles. Also the bigger hole in the centre will help with sub sound hopefully.