Look at the rear hatch lock. see that gap around it? wondered what goes there? it is this piece! subjected to ultra violet damage, this piece has long ago deteriorated. replacement is as easy as a snap and you will stop the water leak.
This is the lock button for vent windows for 356b t-6 and 356c models.
When the knurled end is turned in, the window is locked. it is a very difficult piece to replate, so we suggest this new part at less than replating costs.
644-542-559-06 vent window lock button, for 356b 356c 1960-1965
Known as: lock ring a 6 / lock ring 6 / lock ring b 6 / lock ring a6 / lock ring m 6
Known as: lock ring a 6 brake 60 mm / lock ring a 6 din 127 phr / lock ring a 6.4
Known as: hexagon nut m 5 / hexagon nut vertical pedal adjustment 30 mm / hexagon nut bm 5
Known as: hexagon nut m 5 turbo-look front spoiler / hexagon nut m 5 snow chains / hexagon nut m 5 f >>92hn4 50198 / hexagon nut m 5 see technical information gr.x nr.15 / hexagon nut m 5 see technical information gr. X nr. 15 vertical pedal adjustment 30 mm