This is the white rectangular plastic float for Solex Pierburg PDSI carburetors.
Please note that there are 2 versions of floats for the PDSI and that this is the rectangular one as opposed to the black round one which can be found HERE.
Required quantity per carburettor:1
This is item number 36 on the drawing of the Solex PDSI.
Please note that this carburetor was marketed as well as under the Solex brand as under the Pierburg brand.