[Boatanchors] Wanted: Meissner part number 18-3578 coil set for MSS, EX

[Bill, N4QA]

Looking to buy Meissner part number 18-3578.
This is the coil set for the 12 meter amateur band, which installs in the coil turret of the Meissner Signal Shifter, model EX. The original purpose for this coil set was to allow six meter operation of a MSS, EX having an external frequency doubler/amplifier stage.
Nowadays, this same coil set could also be used to allow the MSS, EX to be used as a low power 12 meter transmtter or as the EXciter for a higher-powered 12 meter rig.
 
No luck yet searching the web for 'Meissner part number 18-3578' and many variations of same.
If you know of one which is available, please let me know.
Thanks,
Bill, N4QA
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