RVFM-Crystal-Mounting-Pad-and-Insulating-Washer-RVFM-BXXXAF-p-Mylar-insulating-washer-HC-49-size-suitable-for-HC49-U-HC18-U-and-other-crystals-and-filters-p-RVFM-BXXXAF-Crystal-Insulating-Washer