The clips are a poor imitation of the original factory ones. Around the glass they locate around the window above the interior/exterior trim level. The original channels do have a similar metal strip spacer for alignment purposes. They are not necessary for the replacement and I discarded mine since they kept coming off. If you have access to a Master Parts Book they are section 16.200 they are called retainers and are mentioned for the 51-53 (my book only goes to 53) but not for the early years. Part numbers are #3699865 and #3699866 (page 712) of the 1929-1953 Master Parts Catalog.
