I have several cracks in the floor of my corner plastic shoer pan. I have used clear silicone to patch the holes. How do I repair this pan so no other cracks appear or how do I find a replacement pan for this shower. I don't know the brand it was installed by previous owner.

A shower pan is not so easily replaced like a faucet or toilet. The pan is set on the floor, usually in some type of cement or compound. The drain is connected to the pan and must first be removed. Any chance of a close up picture of the drain? Swanstone makes many sizes of pans. Swanstone Products