Yep!!! My MFJ-259B has lots of guts too.
The dipper coils are used to make the Analyzer operate like a grid dip meter.
Extremely useful for tuning traps, tanks, etc. They are an accessory to the
Analyzer; I think the part number for them is MFJ-66.
There are two coils in the set, one for 1.8 MHz to 50 MHz, the other covers 20
MHz to 170 MHz.
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Assuming that these dipper coils are connected to a PL259 plug for
connecting to the MFJ259B 's SO239 socket , it should not be too
difficult to homebrew the coils .........I'll have a go at that.

Frank GM0CSZ / KN6WH