thanks
DL
Not positive what you're asking, but would guess you're talking about matching the mounting feet to the curvature of your hull?
If that's the case, Samson is the only manufacturer I know of that will give you mounting plates that are machined specifically to match the curvature of the surface you're mounting to. They are definitely not cheap, but you get what you pay for.
If you go with a cheaper universal tower, you'll want to be sure you take extra steps during the install to avoid gel coat cracking. There are a number of posts in the wakeboarding forum that discuss this topic.