Your link needs to take out one of the http:// 's, you have two of them which makes the link not work. (or just delete the first http:// when the link says that the page cannot be displayed.)
Meanwhile, I have no experience with these--however, Halsey Automotive in Portland sells Bosch or Beru (your choice)
OEM Glow plugs for $17 each, no sales tax (Don't know about shipping) You can contact them at this number:
Phone (503)256-0182
info@halseyimportparts.com
Cheers,
-BB