This item has unfortunetly been discontinued. There is not a manufacture who still makes one that will work in place of this.
However you can eliminate the need for a squirt guard gasket by using the new style squirt guard by Norpro. Which can be ordered here: Norpro Squirt guard # 1951-11
This new style squirt guard will work on the Back to Basics 200, Norpro 1951, Universal 800, Victorio 200/210* & Villware 300 food strainers. This squirt guard will differ from your original squirt guard, it is shaped like a "U" and covers the top, back and bottom of the screen. This squirt guard does not require a squirt guard gasket, or a squirt guard screw.