Hey PW,
That is exactly what I have in my 1st Gen. It is functional but the one thing I did not like was the back-rest part. It is secured by a heavy 3" by full length velcro strip. After about 3 years the summer heat weakened the adhesive and it came loose when I tried to remove it for cleaning. You also need to have someone sit in the back to make sure and 'place' it correctly, otherwise it hits you in the back either too high or too low.
I just did a post on the name, model etc. recently. If you want specifics let me know I'll email it to ya straight away.
Regards, bob.