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About the cap, you can use "generic" polyester cap with proper capacitance; basically any will handle the required current (exception is the very small ones for signal).
The generic bipolar cap can be upsetting the horizontal linearity due to ESR. If this is the case, the poly cap will restore correct operation.
The series inductor probably is a premagnetized inductor for correcting the linearity at opposite side that the cap corrects. So, is a special kind of inductor, also. By the way, a pincushion one will resemble a mini transformator, with at least 4 terminals.
Then, is interesting to play with proper cap first, to see the result, with the linearity inductor in place.
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