The rear suspension arms have this round rubber mount in the inner side locating the arm in the car body. This piece is a round rubber donut anis is used on all Porsche 356s. On cars up through 356B T-5, this rubber donut piece is also used on the outer side of the suspension arms. Sold individually.

For T-6 cars, a different rubber is used on the outer side. For a Ribbed Rubber Torsion Donut, see 644 333 131 01.