The problem with Arm rest from the Scion is the actual Hand break will be on the different side.
I have a Build 1, so I am waiting on a reply from Toyota for info on a Build 2/3 Centre Console Arm rest and was quoted from one place at $2400.
I am thinking along the lines of something like :
"BLACK CENTER CONSOLE ARMREST STORAGE BOX w/ DOUBLE CUP HOLDER"
http://www.ebay.com.au/itm/290643666276?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649
That one looks like it could fit.
I like the look of this one, but I dont think it will fit:
"USA CARBON BLACK LEATHERETTE ARMREST BOX CENTER CONSOLE"
http://www.ebay.com.au/itm/270904913678?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649