{Collins} fs pair of 2.7 khz filter for 51S1 or 51J4

I have a pair of collins mechanical filters which would work in either the collins 51S1 or 51J4 receivers

1) F500Z4 , PART#526-9377-00, 2.7 KHZ  USB

2) F500Z5, PART# 526-9376-00, 2.7 KHZ  LSB

Asking $135 including shipping  for the pair to anywhere in north america.

73 from Fern  VE7GZ

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