Is this an exact replacement for the vacuume cap used in the BC-442A and RE-2/ARC-5 relays?? http://cgi.ebay.com/GE-GL-1L38-8047-50MMF-7-5KV-Radio-Vacuum-Tube-Capacitor-/130558611777?pt=Vintage_Electronics_R2&hash=item1e65e65141