d16y8turbo

i have a greddy turbo, which i believe is just a regular mitsu turbo. the oil feed line connecting to the top of the turbo uses a banjo fitting with a bolt and two copper washers, similar to the one used for a hondas fuel filter and fuel rail.
i overtightened the bolt a while ago and it broke, and i've been driving around with something i rigged up using a different bolt, silicon gasket maker, and an o-ring. i figgure i should go back and do it right this time, but i've been having a hard time finding the part. i e-mailed greddy, and they told me that i could get the bolt where i got my kit. i went there, and they said wtf??? and called greddy. they said try autozone...but there isn't one near my house, so i tried advanced, pep boys, and fairfax auto parts, which usually has everything. where do i find this bolt???
is it interchangable with other parts?? it looks a lot like the size of the brake line stuff.

do stock mitsu turbos have this bolt?
i'm confused, help me plz!!!