I don't know about the specific hardware since I haven't torn down an engine, but what ETKA tells me is this: what appears to be the bolt that holds the oil squirter on is part # N 902041501. It's an M6x10 bolt. It says AHU up to engine number 100000, and also 1Z and AAZ. There are two different oil spray jets too: 068103157D, used up to engine AHU100000 (M10 thread), then 028103157A, used from engine AHU100001. There is no part listed for the bolt from AHU100001. The later (028) spray jet is also shared with the Mk4 ALH TDI, however, curiously, there is no part number anywhere for the retaining bolt.
Voice of experience: Part # NOT N902-415-01. Ordered the 415-01; it's entirely different. It's just a small screw.
The correct part is an M8 bolt with an integral spring-loaded valve. The spring pressure closes the valve at low pressures, as at idle, and allows oil to spray under the pistons when pressure is higher.
Will post pictures…
First is nozzle & bolt:
Overall length of bolt is 22 mm.
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