FWIW both the 145 & 545 have gear drives in them for the hook,the 1245 has the drive belt & just a set of gears below the bobbin.
Art is correct too! I just ordered a set of gears for under the bobbin f/a 145 & they are $120.00.the hook(a good brand) runs around $200.00,most of the feet,feed dog,needle plate are after market & less than $20.00 ea.
Bob