Most common shiai items (with the exception of eye patch and mullet) are hairs, not 3d items.
You can preview them if you find someone with the item and copy the 'HAIR#' lines from their item.dat file, or you can use these.
All of the shiai hair items codes:
HAIR0 0; 1 8 300 80 60 5 10 40 0 5 30 20 25 3 0 50
HAIR1 0; 1 8 0 122 307 5 10 30 0 4 30 20 25 3 0 50
HAIR2 0; 1 8 0 78 324 5 10 30 0 5 30 20 25 3 0 50
HAIR3 0; 1 8 0 43 330 5 10 35 0 4 30 20 25 3 0 50
HAIR4 0; 1 8 0 1 305 5 10 35 0 5 30 20 25 3 0 50
HAIR5 0; 1 8 60 80 300 5 10 40 0 5 30 20 25 3 0 50
HAIR6 0; 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
HAIR7 0; 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
HAIR8 0; 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
HAIR9 0; 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
HAIR10 0; 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
HAIR11 0; 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
HAIR12 0; 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
HAIR13 0; 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
HAIR14 0; 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
HAIR15 0; 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
HAIR0 0; 1 8 0 70 180 10 10 10 10 17 20 30 100 10 0 40
HAIR1 0; 1 1 0 69 0 10 10 20 25 5 25 1 59 0 0 100
HAIR2 0; 1 8 4 74 181 10 10 10 10 17 20 30 50 10 0 40
HAIR3 0; 1 8 1 78 179 10 10 10 10 17 20 30 50 10 0 40
HAIR4 0; 1 8 0 75 181 10 10 10 10 17 20 30 100 10 0 40
HAIR5 0; 1 8 2 79 180 10 10 10 10 17 20 30 100 10 0 40
HAIR6 0; 1 8 0 78 180 10 10 10 10 17 20 30 100 10 0 40
HAIR7 0; 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
HAIR8 0; 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
HAIR9 0; 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
HAIR10 0; 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
HAIR11 0; 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
HAIR12 0; 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
HAIR13 0; 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
HAIR14 0; 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
HAIR15 0; 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
HAIR0 0; 1 8 0 70 180 5 6 25 0 5 5 15 47 10 0 100
HAIR1 0; 1 8 330 80 180 5 6 25 0 5 5 15 49 10 0 100
HAIR2 0; 1 8 300 80 190 5 6 25 0 5 5 15 100 10 0 100
HAIR3 0; 1 8 270 90 0 3 6 25 0 5 5 15 30 10 0 100
HAIR4 0; 1 8 230 110 0 3 6 25 0 5 5 15 50 10 0 100
HAIR5 0; 1 8 30 80 180 5 6 25 0 5 5 15 49 10 0 100
HAIR6 0; 1 8 60 80 170 5 6 25 0 5 5 15 100 10 0 100
HAIR7 0; 1 8 90 90 0 3 6 25 0 5 5 15 30 10 0 100
HAIR8 0; 1 8 130 110 0 3 6 25 0 5 5 15 50 10 0 100
HAIR9 0; 1 8 0 230 0 3 6 25 0 5 5 15 8 10 0 100
HAIR10 0; 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
HAIR11 0; 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
HAIR12 0; 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
HAIR13 0; 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
HAIR14 0; 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
HAIR15 0; 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0