52520
Factory-original service kit for the Dellorto PHM38BS and PHM38BD as used on the BMW 90S.
The PHM series comes with two different top covers which are illustrated here:

This service kit is specifically for the flat top version and contains all the necessary gaskets, o-rings, fiber rings and a rubber cable boot as per the product photo.
This product is priced and sold as a single unit.
Required quantity per carburettor: 1
This is item number 91 in the drawing of the PHM.
Please click HERE for that drawing.
Please note that this service kit does NOT include the important pump diaphragm:

This is Dellorto Part Number: 52520