See my post above. The only 345/30-18 available is the Sport Cup and it is shorter than the 335/30-18 stock Pilot. I don't believe there is such a thing as a 335/35-18 and good luck finding a 345/35-18.
Tires are not always what the numbers specify. 345 x .3 = 103.5 mm, 335 x .3 = 100.5 mm. As we can see, the 345 series tire "should" be taller since they both have the same aspect ratio.
It really is helpful if you can get ahold of the manufacturers spec. chart.
I've been trying for quite a while. Please post if you (anyone) finds them. I believe it is an old Lambo tire that they just don't make anymore or maybe only if you have a Lambo do you get a chance at the remaining stock.
The 345 would be great because it would be the same height as a nineteen but with an inch more sidewall, giving a little more straight line traction and in my case, eat up some of my way-too-low 3.55 gears.