1/4 panel skins HELP! 69 rag top

[bigtyme1]

ok Guys, I'm real close to putting primer on this week end, I have run into a problem trying to get the correct body lines on the 1/4 panels. This is a convertible, behind the door from the top down about 4 inches back I think there is supposed to be a concave area, Can any body give me a measure ment? These were skins we put on the car so you know there's alot of body on the edges. I can't seam to figure out this line.