The Cap Nuts listed below fit the following EMPI Wiper Arms: 98-9552 / 98-9555, 98-9549 / 98-9550, 98-9556 / 98-9557. They fit Type 1 and Conv. 70-72, Ghia and Conv. 70-72, S/B 71-72 and Type 2 69-79. The silver ones are raw aluminum and the black ones are alunimum painted black. The hex head is 13mm and the threads are M6 x 1.0. Sold Each.