Topic: 68 Seat Belt Buckles

[68 S Code]

Looked over the seat belts trying to get them ready for install. Had a couple of extras laying around and noticed that Ford used at least 2 different suppliers in 68. Most are marked HAMILL but had a couple marked ROBBINS JR. The manufacturer name is on the reverse side of the operable buckle. Anyone ever notice if one was used for one plant while another supplier for another plant?