Upper Housing Locknut for MerCruiser Alpha One Gen II sterndrives. It locks the associated upper-housing fastener in position. Use product code REC11-859135 to identify the offered product. It cross-references to MerCruiser 11-859135. Selection warning: Match product code REC11-859135 and its OEM cross-reference to the part being replaced. Confirm the drive serial number and assembly before ordering. Product specifications Product Upper Housing Locknut Product code REC11-859135 Assembly area Upper driveshaft housing Key points Product code: REC11-859135 MerCruiser cross-reference: 11-859135 Confirmed application: Alpha One Gen II, serial number 0L100040 and later Assembly area: Upper driveshaft housing Installation and selection context The upper housing locknut under product code REC11-859135 belongs to the upper driveshaft housing. Match the product code, OEM reference, drive serial number and assembly position. Compatibility and fitment Equipment MerCruiser Alpha One Gen II sterndrive Confirmed range Serial number 0L100040 and later, 1998 onwards Assembly area Upper driveshaft housing The confirmed application for Upper Housing Locknut under product code REC11-859135 is the drive and serial scope shown above. The product may have other applications where the same product code and cross-reference are independently confirmed. What to check before ordering Confirm the upper housing locknut under product code REC11-859135 against the component being replaced. Match the product code, OEM reference, drive serial number and assembly position. Part numbers and cross-references Product code REC11-859135 MerCruiser cross-reference 11-859135 OEM references are provided for identification. A cross-reference does not mean the item is supplied as a genuine OEM product. Before ordering Confirm the sterndrive model and full serial number. Check product code REC11-859135 and every recorded MerCruiser cross-reference. Apply the ratio, side, material or serial-break instruction where one is stated. Compare the replacement part with the component being removed. Contact TMP Global with the drive serial and photographs if any identifier differs. Frequently asked questions What does REC11-859135 replace? It cross-references to MerCruiser 11-859135. Does REC11-859135 fit every MerCruiser Alpha One Gen II drive? The confirmed application for REC11-859135 covered here is the MerCruiser Alpha One Gen II upper driveshaft housing for serial number 0L100040 and later. For an earlier drive or another assembly, match the product code, OEM reference and technical data before ordering. Where can I see this part in the exploded diagram assembly? View the MerCruiser Alpha One Gen II upper driveshaft housing exploded diagram and locate reference 17.