These are pretty simple...... but definately needed as the stock one is usually trashed or lost when setting up the axle. They are made undrilled so when you put your 14 Bolt Axle under your Nissan Patrol you won't have the wrong sized hole. Just drill it for the lines you have and don't play with correcting it to make it work with your brake lines. These are made to mount to the top 3 Diff Cover holes for a very secure connection and they are made of 1/4" (I know thats huge but it keeps from wasting steel). They all have a 90 degree bend towards the vehicle front end, so if you intend to use them with a truss....... call us and we can bend one the other way. So far they are only available for a D44 & 14 Bolt.