bronco is a 32" scale neck if i remember right and the thunderbird is a 34" so with the bridge not being movable the bass will not intonate properly/at all so will0 be out of tune, seroiusly out of tune.
but the fender style neck and T bird body will work..... as will the pre built bach, probably cheaper than ebay parts too
but the fender style neck and T bird body will work..... as will the pre built bach, probably cheaper than ebay parts too