Thank you for the information. First the gray cloth interior is the standard GT cloth interior, which I had that in my car, very common. I replaced mine years ago with the roush leather interior and sold the cloth seat covers and foam for around $150 many years ago. I believe the driver and passenger cloth covers are the same, so you might try finding one in a junkyard.
You car was one of the last 20 - 30 cars made in model year 2005 as the last was Sept 14, 2005. On 8/29/05 they made just 9 cars, some hardtops, some conv.