[GreenKeys] Looking for filter

[Rokumon Cat]

Hi All,
 
I have come into possession of a Northern Radio Company Dual Frequency Shift tone Keyer type 153 model 2, and it was NIB to boot. The package was still sealed and dated 1955. It is brand new, and even has the two power cords with the strange little threaded fittings on the unit ends.
 
Thank you to you know who!
 
I am now looking for the filter boxes that fit into spaces on the top plate of the unit. They need to be appropriate for amateur use, with 2125 mark and 2975 space. If anyone has one of these for sale, let me know off list.
 
Best,
 
Joe
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