What kind of parts? As far as I know(and nobody from our government tells me anything), most, if not all, of our 7.62NATO 1919 Brownings were chopped long ago.
Gunparts is listing most of the parts required to use 7.62 ammo in a .30 Browning. Not exactly cheap though. $99.15US for a bolt. Brand new, in-the-wrap, Israeli barrels for $83.95. $73.45 for an excellent to new barrel without the wrap.