16ER18UN-A1 CP500 External Threading Insert WTD2000 accepts the adjustable-style needle and

accepts the adjustable-style needle and seat assembly

Here's some notes from our Land Rover Master Technician on the issue: Dexron II (the original OE spec fluid) was officially replaced by Dexron III and this is now the spec fluid for Range Rover Classic and Discovery I

including exact match factory colors

Water Neck

16ER18UN-A1 CP500 External Threading Insert WTD2000 accepts the adjustable-style needle and18 TPI UN external threading insert. "A1" is an optimizing geometry for steel components Grade CP500. This grade features a highly wear restistant PVD coating to provide dependable machining for a large majority of common thread turning applications.