Sparex source: https://us.sparex.com/gear-knob-44064.html Product: Gear Knob - Sparex S.44064 SKU: S.44064 Listing note: Engraved - Overdrive (3/8'' UNF)Replaces: 1677998M1Fits: 670, 690, 698, 699 Detail enrichment pending: OEM cross references, fitment, catalog pages, and full specifications.