The bulkheads sit slightly wider apart on the K1, so anything that bolts between them is un-usable without modding, shock towers, link mounts, etc. Front and rear suspension arms, yokes, hubs, arm mounts and all usable. Sx3 rear rear inner arm mount would need drilling out to 4mm to use on K1. Front driveshafts usable, not sure on rears. Sx3 rear arms have a short outer pivot pin from each side of the a arm, K1 uses a single long pivot pin, but still usable if you have the correct pivot pins. Diff metal parts look the same, but with different pulleys. All bulkheads are different.
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