https://www.titleist.ie/teamtitleist/team-titleist/f/golf-clubs/20584/910-driver-and-fairway-weight-ports Hi, I have the D2 driver, 15*F, 19*F and 21*H all with Titleist Bassara shafts. I've noticed the 7 gram red port weights have different depth indentations. when you unscrew the weights, the depth in the back of the weights are different. They areen-USTelligent Community 10