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What filter shape are you looking, Tchebychev, Butterworth, Guassian, Transitional etc? If just looking a synchronously tuned filter you might try looking at waveguide sections using 1/4 wave spacing. The tangent losses in microstrip structures will likely be way to high for the Q's you will...
For your application you need to know the rejection wanted at the Local Oscillator Frequency and Image Band Frequency. I assume this is for pre-selection at the channel of interest. Thus if the vendor is using a high side Local Oscillator then the filter needs to suppress the Local Oscillator...
Some links of interest
https://www.jlab.org/accel/inj_group/docs/Coaxial_Resonators.pdf
The above is pretty much the beginning of Helical Resonators.
A monograph by Peter Vizmuller titled Filters with Helical & Folded Helical Resonators is probably the most concise work that a filter designer...
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