Okay so I;ve got a couple of different opinions on the wide-arch kit I\'ve got, one says it\'s an Origin kit, the other says it\'s a replica kit, so I just don\'t know.
The specs from RHDJapan say the Origin front arches are +20mm, and the rear arches can be either +30mm or +50mm.
As far as I know, my rear arches will be 50mm wider, and the fronts will be about 20mm wider once they are on.
I don\'t know exactly how to measure this, especially on the front where you have to take the existing wing off to hang the wide one, so I don\'t have a good point to measure the difference from at the front.
These are the pictures of it that I have.
(http://www.mazdarotaryclub.com/forums/attachment.php?attachmentid=48486&d=1281169809)
(http://www.mazdarotaryclub.com/forums/attachment.php?attachmentid=48487&d=1281169809)