Here is a site that sales RFI kits. I have ordered the kit for the 7300 and also the appliance kit. I'll report back with findings
Good place to get RFI chokes! Note the 100% 5 star rating.
Whenever I buy RFI chokes I try to order a nice selection of sizes to keep on hand. That way whenever an RFI problem raises its ugly head you can attempt a fix immediately!