the R33 was not made in 93 the first year for the R33 was in 95.

R32, 89'-94'
R33, 95'-98'
R34, 99'-present

hear is a site with the info...
http://www.motorex.net/skyline.html#
http://www.jbskyline.net/R32/GTR/

have fun and good luck!