As a quick followup, I bought the Stanley Cookset at Amazon. I paid $16.99, but the price seems to vary on Amazon from day to day (?).

Arrived yesterday. It's a very nice little cookset. It is nicely made and I know it will serve me well. The cookpot fits perfectly in my Firebox ring that I was wanting to use. This is a very good cookset for this Firebox, should anybody else own one of these. There are two plastic cups included, billed as "heavy duty". Heavy duty is an understatement. These are about the most robust plastic cups I have ever seen. The plastic has a very solid feel to it and is 3/16" thick. No worries about damaging these cups.

This is a good small stainless cookset for those of us not wanting/needing the super lightweight titaniam setups. Well done, Stanley! I am very glad I purchased it.