PitReplica gets a lot of business from the members here. They offer both a small font and large font logo depending on the year of your 350. If you have a 1971 white tank GTO. you'd want the large font seat cover.
If it's a 1970 gold tank GTO, you can use the small font which is the correct size but not placed correctly for the GTO's.
More info here.....
http://bridgestonemotorcycleparts.com/index.php?topic=2535.0