The Cap Nuts fit the following EMPI Wiper Arms:
98-9552 / 98-9555, 98-9549 / 98-9550, 98-9556 / 98-9557.
They fit Type 1 and Conv. 1970 to 1972, Ghia and Conv. 1970 to 1972,
S.B. 1971 to 1972, Type 2 1969 to 1979. These are aluminum painted black.
The hex head is 13mm and the threads are M6 x 1.0. Sold Each.