Kerry,
What would a 617.912 go into, a 123?

I just bought a factory 615, 616, 617.91 engine manual off ebay.
I hope it will correspond to my 1976 300D.
Thanks

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63 220S W111
76 300D W115
2013 VW JSW TDI M6

previously-
73 280 SEL 4.5
86 300E 5 speed
2010 VW Jetta TDI M6