Sparex source: https://us.sparex.com/levelling-box-gear-housing-3-4-539.html Product: Levelling Box Gear Housing - 3/4'' - Sparex S.539 SKU: S.539 Listing note: Fork Hole Ø mm: 16mm, Width Internal : 44mm, Width External mm: 75mm Detail enrichment pending: OEM cross references, fitment, catalog pages, and full specifications.