[volt-nuts] Fluke 5100B Calibrator‏ Repair Help

[David Smith]

I need some help with repairing a Fluke 5100B Calibrator. 
The capacitor support bracket fell into the power supply module and vaporized both varistors, RV1 and RV2. A call to Fluke tells me they no longer can supply these MOV's. According to the manual's parts list these varistors are in-house parts by Fluke. I have no way of determining a substitute part. Is there anyone that can help me identify what could be a useful replacement?
Thanks,
Dave - W6TE