Made from our own pattern equipment these are cast in LM25 and heat treated to TF which is a far superior grade of aluminium than the original. These are then totally CNC machined, this not only means they are considerably stronger than the original and far more accurate on the alignment. There is a choice between the original clutch release fork mechanism or a solid pad in the centre to accept your own co-axial release mechanism. Also the choice of the original large starter dog housing (for the original starter) or our slim line design (when using our modern pre-engaged starter) which helps to make it possible to remove the gearbox from the car leaving the engine in place. Fits any 4.2 all synchro gearbox with either 3.8 or 4.2 engine (Not suitable for 3.8 ring gear or starter.)