is it a genuine veilside front bar?? if so, its probably worth a couple of thousand, a full veilside kit usually costs about 10k, because of the material it is made from - urethane.
a more common alternative is an imiation fibreglass kit, from carmate or someone like that. these would be worth about 400 bucks.
not sure about modding it for your st162, but i would imagine it would be quite difficult.