Sparex source: https://us.sparex.com/levelling-box-yoke-1-uns-11506.html Product: Levelling Box Yoke - 1 Uns - Sparex S.11506 SKU: S.11506 Listing note: Thread length: 122mm, Length : 391mm, Fork Hole ø mm: 19mm, Width Internal: 50mm, Width Ext.mm Detail enrichment pending: OEM cross references, fitment, catalog pages, and full specifications.