They aren't the quickest to respond in my experience either...give them a week or so more. (They operate under a more traditional manufacturer-retailer model than what is de riguer....where they expect you to buy and get support like this from a retailer - the place where you bought the reactor. They will respond, but they are presumably busy making widgets. ;))
Just in case you haven't already tried, a local retailer (or one of their suppliers) should be able to get something like this for you without too much trouble.
All IMO/E. :)
-Matt