http://www.rhdjapan.com/cusco-adjustable-pillow-ball-tension-rods-nissan-9366
Product Specs Brand : CUSCO
Product: Adjustable Pillow Ball Tension Rods Nissan
Part Num: 220 473 AS (RS13,RPS13,S13,PS13,HCR32,Y32,A31,Z32,C33)
Part Num: 232 473 A (S14 Zenki,R33 Zenki)
Part Num: 232 473 AN (S14 Kouki,S15,R33 Kouki,ER34,WGC34)
Part Num: 231 473 ASN (HNR32,BNR32)
Part Num: 233 473 A (BCNR33)
Part Num: 290 473 A (WGNC34 no 260RS)
Part Num: 233 473 A (WGNC34 260RS)
http://www.nengun.com/cusco/adjustable-pillow-tension-rods
Accordingto these sites the part number for R33GTR is 233 473 A