Brother xl 4023 shank?

i brought a brother xl 4023 sewing machine and there was 3 peices missing the shuttle casing [bobbin holder] the shank [peice that the foot attaches to] and the bit that holds the cotton real on [bit that pokes up from the top of machine] i have no idear where to get these parts from and lookin on the net not sure if its goin to be the right part