This part is listed by BMW as BMW part number 13641360378 (13 64 1 360 378) and is described as the cold start injector for 1980-83 E21 320i and 323i.
This is a Genuine BMW o-ring with a two year warranty. Buying a Genuine part will usually be more expensive than an OEM or aftermarket brand but you are assured that it meets BMW's designs for fitment, performance, and longevity. It will also be the very latest design, incorporating any updates or revisions that an aftermarket brand typically will ignore.
For full BMW fitment information or for assistance from one of our BMW experts, we recommend calling us at 877-639-9648.
BMW Fitments:
3 Series
E21 (75-83) > 320i
E21 (75-83) > 323i