[Boatanchors] Source for 6 inch coned speakers

[John King via Boatanchors]

Hi Clyde and all. I am looking for a source to purchase  a pair of 6 inch round coned speakers for communication audio frequencies. In other words high fidelity is not a goal and power rating to handle the audio from  a Hammarlund SP 600 JX 16 and a Collins R390 receivers. These are going on a panel in a rack of receivers replacing a pair with rotten cones. 

Hoping some of you might know of a parts company that stocks such  speakers.  Thanks for reading and any assistance. 73, John, K5PGW