basically it sits above the floor pan rathjer than underneath, and ha helicopterjoints instead of pivots, really, good, REALLY xpensive and a bitch to set p, gte working, speak to fearless on here, he fitted brett warburtons one and says its abitch!
Grp A gear linkages eliminate the excessive play found in standard linkage mechanisms by means of removing rubber pivot points and doing away with the damping features designed into original linkages that cut down on excessive vibrations and noises transferred from the engine/transmission into the passenger compartment !!!! - or something like that !!!
By means of linkage rods and a different gear lever, a more direct route is taken - however this method is really only recommended for 'dog' gearboxes, where the gear throw is less !! - although they can be converted for use with syncro boxes
Depending on which car/engine combination it's to be fitted to - Astra GTE /Nova 1.6 - linkage rods are available from Harry Hockley Motorsport