So here's a bit of info on how to look up 7 digit part numbers. All BMW numbers are 11 digits. One's with only 7 digits have an implied first 4. You can still go to a site like realoem.com and input a search with the 7 numbers to get the full 11 digit number. For example go to the BMW landing page http://www.realoem.com/bmw/enUS/select and enter the number under PART NR APPLICATION SEARCH.
51141363259
LABEL "TRANSISTORIZED IGNITION"
From:09/01/1978To:03/07/1990 (ENDED)Weight:0.001 kgPrice:$1.25
Superseded by:
51142121919 (06/05/1987 — 06/02/1992), Exchangeable retrospectively71212122014 (01/08/1991 — ), Exchangeable retrospectively
51142121501
LABEL "ORIGINAL BMW TEILE"
From:02/01/1985To:11/09/1990 (ENDED)Weight:0.002 kgPrice:$0.33
Superseded by:
51142121174 (03/01/1988 — ), Exchangeable retrospectively
2121870 doesn't show a listing although the original part number would be 51 14 2 121 870.
As to whether the superseded versions fit your needs I can't evaluate. If you're going for a totally original restoration they may not. Maybe someone knows of a source doing reproductions. If you want to browse what parts are available, labels are found in group 71 03 (Equipment Parts>Labels)
"Howdy, Folks!"
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