The FM uses a PTO ( permeability tuned oscillator). Zenith used it
up till the mid 60's. The coils tune instead of the caps. Very stable, precise
& expensive ! Only found on car radios & high end communication receivers
to my knowledge.
I would at least change the grommets, they may effect the dial cord if
nothing else. Other parts can be stripped from a junker. I would guess
Zenith made the minimum changes over the years & they built millions
of these in almost 20 yrs.
Also think twice about changing caps in the RF amp, osc & mixer. The
front end is tricky to align & its best to avoid it. New caps will almost
have to throw things off.
BTW the dial cord IS the hardest thing to deal with on radios. I never
got the hang of it. We had one cat that had the special talent & all of
us passed dial cords to him.
73 Zeno
LFOD !