Part No is 80-6065 not sure if there -30 or -35, but i wouldn't pay much attention to what they put on the box anyway, as i had -30mm Ventura springs before and the difference in drop between the two was was prob about 15mm.
Drive is still smooth allthough can be a bit bouncy over bumps, but you will have to expect that from any lowering springs to some extent..
Hope this helps
Phil