to be honest mate,your better off selling all you have and buying the 4x4 disc's and calipers....you can get the 2wd calipers to fit but have to grind parts down,and unless you change things like the servo and master cylinder you wouldnt notice any gain over the 4x4 stuff.....id say a big no no to the 2wd disc's though.... for one,putting all these washers on will mean there will be no bolt left to hold the wheels on.... i recon you should be able to sell the stuff you have and get enough to afford the 4x4 stuff...