Thanks for looking out. I did my research (including what you have posted) so I knew the front rear brace wouldn't work. I bought them off eBay (think it was directly from UR). I bought a Tanabe front strut bar a couple of weeks ago so that's all taken care of.
Speaking of research, I've been looking into bushings for the rear sway bar, since I'm going with the Corksport (the JBR rear is too thick for me, I'm afraid the ride will suffer too much). The purpose of the bushings is to located the sway bar. It needs to be able to move freely within the bushings, a little drag is ok but you don't want too much. One place I went to said it shouldn't be more than 0.5 mm less in diameter than the bar. Given that, I have found the Lexus GS300/400 came with a front bar of 28.5 mm (same size as the Corksport). Unfortunately I haven't yet found a bushing kit (including the brackets) only replacement bushings, and since I know my local junkyard doesn't have any Lexi I have no avenue to source the brackets. Several manufacturers do offer a 28 mm bushing kit though so I'll probably end up going with that.