[Kenwood] Kenwood Surge Protector Substitute ?

[Steve London]

Anyone have a suggestion for a substitution for the DSP-301N surge protector 
that was commonly used at the input to the RF board on the TS-850 and TS-950 ? 
It's a Mitsubishi part that doesn't seem to be easily available at sources such 
as Mouser and DigiKey.

Thanks and 73,
Steve, N2IC