2012-08-28, 14:41 (This post was last modified: 2012-09-08, 18:32 by Steffen.)
This part has two versions, an open stud one and a closed stud one. Only the open stud one is existing.
BL and peeron only list one version, but the pics on peeron show two.
Here another picture of the closed stud version from ebay.