it is difficult to create an extensive research of the subject that is common in an extremely limited space of the training, as well as in situation of the subject that is slim you might find one not able to state all that much. they are direct replacements for the standard land rover part. look it up if you haven’t seen either. and probably there are a lot of other factors that are weighing in. that’s like having a great run game and defense in football- an obvious recipe for success. 