first of all, are you looking for these struts for a S30 or a S13? maybe they are colored the same, but look at the shaft diameter on the rears in the picture you linked. Those are the units that are included in the S30 kit, not the front ones in the S13 kit you linked to, which are similar to the newstylemotorsport.com set in the second link. I dont know much about the upper-end of the racing-shocks range, but the "big shaft" ones at AZC look pretty.