Porsche 964 928 Cover for Wiper Arm Nut (x2 covers) Cover for Wiper Arm Nut (set of 2) Brand NEW part with full 1 year warranty. Porsche part# 928 628 623 01, check fit below. Recently made by SWF - VALEO (OEM), not been lying around. NOTE: 964 fits 1992 - 1994 only.