For Pre-A thru 356B T-5 -- This is the small ivory knob for the wipers in 356 Pre-A thru 356B T-5 models. Two of these knobs are also used to switch the distributors when a Carrera engine is installed.

Diameter at the end of the knob is 12.80 mm and internal thread is 3.50 mm x 0.60 mm.

One of these knobs is in our 15-piece Complete Knob Set, see NLA 552 KNO IVO