This D320.19 Center Support Bushing Stud from Gitzo is a spare or replacement part for various tripods and center columns.
Compatible Tripods and Center Columns
G1312, G1317, G1318, G1320, G1326, G1327, G1329, G1341, G1346, G1349, G312, G315, G317, G320, G322, G326, G328, G341, G346, GS3310S, GS3311S, GS3511S, GS3512S, GT3330, GT3530, GT3531, GT3540, GT3540L, GT3541, GT3830, GT3840C, GT3340L, and GT3541L
UPC: 719821109273