Is there an adapter to convert the xB 4 lug toa 5 lug so that the tC stock rims will fit? or am I just wishing, and would I just be beter off buying some 17's . I amon I VERY limited bugget. 8)

yes there are adaptors

i would suggest just buying similar style wheels fitted properly for an xB

here is a link for the adapters www.wheeladapters.com