...Work in progess. Of the six pistons in this set, only 4 pistons are a perfect match while the remaining 2 were uniquely modified when deeper valve pockets https://pbase.com/slidevalve911rsr/image/53784763 were machined and the side-skirt removed on this one here https://pbase.com/slidevalve911rsr/image/53784761. To create a usable matching set, deeper valve-pockets will have to be machined on the others as well as removing the side-skirts. I will be posting more photos as this project progresses.