Sparex source: https://us.sparex.com/levelling-box-fork-3-4-unc-11315.html Product: Levelling Box Fork - 3/4 UNC - Sparex S.11315 SKU: S.11315 Listing note: Length 520mm, Fork Hole ø mm 19.5mm, Width Internal 21mm, Width Ext.mm 46mm Detail enrichment pending: OEM cross references, fitment, catalog pages, and full specifications.