EDITED
im planing to make my own girht, it's prety easy
you need 14 cotton strings 8mm or 5mm, i think 8mm its correct,
<img src=http://www.sodimac.cl/stores/sodimacvc/images/prod/FERRETERIA/Fijaciones/52383-g.jpg>
be sure the large of the strings are a bit more large, you know just in case, if you see any pic of girht you can make your own, they are sewn in 3 places ie:
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also you need the two buckle belt
the first 7 wires go on one buckle and the second 7 in the other.
Sergio