I purchased this seat last year so I'm sure the number is correct. Not sure of the difference between the two seats other than price and design. Looking at the picture of the Sun Ray seat in the Harley accessory book they are made differently.
I really like the 08 SEUC seat compared to my 10 but everyone is different.
Before I decided to spend the $ for this seat I found a 08 SEUC bike at a dealer I could sit on and check out.