*sigh* you saw a set of wheels on YAJ and went "OMG fullysick dishhh uleh I must have it!" didn't you?
What you probably didn't account for is that 11.5 +26 makes your wheels sit around 2 inches too far inside so it will hit your shocks unless you run some chronic spacers. This is in addition to sticking out of your guards by about 30mm, so lets say you space out the wheel by about 30mm to clear the shocks, you'll then need a 60mm overfender to clear the rim (run stretched tyres and you should be able to sit it at a decent height and not collect the fibreglass fender with your tyre and send it all to hell... or look like poser and run it at 4WD height).
rear fenders NEVER fit straight up. not even japanese ones. I imported a set of D-Max ones straight out of japan and even then we had to trim the fibreglass and sand out the imperfections etc.
http://www.dmax-cs.com/aero/r32/index.html
http://page9.auctions.yahoo.co.jp/jp/auction/k121228644
Nice buy from Import Monster though, and 155,000Y isn't actually that bad a price for em. But I wouldn't wanna be the guy trying to shoehorn them under an R32 GTSt, especially the 10.5 +26 in the front, without resorting to something like a BN widebody kit.