Maybe someone out there has those ferrite slugs listed for sale, but I haven't found them yet. The radio is sold with no slug in L16. Comes that way. The slug in L14 exists mostly so you can adjust the carrier down to the legal 4 Watts. Max output occurs with the slug removed, so now you know why it's missing. Extremists who want it to be adjustable will change the adjustment range of L14 by unsoldering it, unwinding one turn from the wire and soldering it back in place. This reduces the inductance so that turning the slug gives you the same effect but with the slug in place, not removed.
What replacement did you have in mind for the final?
73