Product review (3 stars): Fits many garbage disposals that use an easy mount system.
In the Product Information Technical Details of this Amazon webpage the Product Dimensions are 3.2 x 5.7 x 3.8 inches, but that's the PACKAGING dimensions.  The Lasco 39-9057 Splashguard has an actual diameter of 3.15 inches and a rim thickness of 0.52 inches.

I also ordered the Wast King 1025 splashguard at the same time and found it too is 3.15 x 0.52 inches, so this size seems to fit a bunch of garbage disposals including my General Electric GFC530V.

The splashguard I found locally was 3.39 inches in diameter, which prompted my on-line search.

While Lasco 39-9057 Splashguard fits, the hole in the center is too small to allow waste to pass without help.  Of course, a person could easily make it bigger themselves.