[Collins] fs pair of 2.7 khz filter for 51S1 or 51J4

[Fern]

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