Screws for attaching Wave heater to legs?

I just finally bought a Wave heater. I also bought the support legs from Amazon. The legs were a returned item sold at a discount over Amazon's usual price. (I know, I know, but I've had good luck purchasing items like this in the past.) Anyways, the legs arrived with no screws to attach them to the heater. Rather than go through the return process, I'd like to just buy some screws at Home Depot or Lowes. Does anyone know what specifications are on these screws? Hopefully, I won't have carry the whole heater in and try various screws! ;)