LAND ROVER SERIES 1, 2, 3, SWB, Front Leaf Spring U Bolts + Nuts 251323, 562637. SWB ONLY Petrol Models. You will notice that the Driver Side U Bolt is a slightlylonger U bolt with different size nuts to the other 3 U bolts, t his is for Driver side to account for the deeper sided part of the axle.