Skykc,
I had the same situation, everyone keep saying to use R33 gtr front shocks for my gts4 as wel.Since I saw your post I download the full catalouge from Bilstein which clearly shows (http://www2.bilstein.de/downloads/Bilstein_Programm_05-GB.pdf) part number F4-B46-1873-HO is for r33 2WD, they didnt have any listing for r33 gts4 though.
I will be buying the whole package from sydneykid when whiteline springs are available for my gts4.Need to straighten up this confusin though.
*looks like there is no diffrent between r33 gtst and r33 gts4 then? I thought r33 gts4 front shocks are shoter than r33 gtst? anyone can clear this out?