Can anyone help please, when selecting first or third gear the gear knob hits the dash before being able to engage gear. new rubber and nylon inserts fitted and both springs in place and working. If I disconnect the gear linkage and move the gearbox lever by hand all gears can be found and engaged. If I unbolt the two bolts by the guide and extend the two tubes by approx 20mm it all works. Are there different length linkage tubes available? Maybe wrong length fitted????