'Fraid so. On the bright side, it shouldn't be too hard to find one and it shouldn't cost much. People are always looking for V8 spool mount Ks to swap out their slants. If you're handy with a welder you could always cut off the V8 mounts and weld in a set for a slant. A bit extreme but doable. If you do swap Ks just make sure that the new one is from a '73 up A body or you will not be able to use your current steering setup...