As you haven't put your model or location I'm not sure where you are Tim?
Anyhoo.The plugs caps seem a little sparse in the USA and Wemoto post to the US and are a trusted International seller.If you get these ones,
http://www.wemoto.com/bikes/honda/cx_50 ... _plug_cap/They are the better/simpler ones I use and don't have the complicated resistor system in them.
But then you should change your Spark plugs to ,"R" rated resistor plugs Standard or Iridium NGK as per,
http://www.pdsrecording.site90.com/cxgl500/Plugs.htmIf there is anything else you need for your bike buy that as wellto help with the wait and postage but change to your model for other bits.