1991 300d, 258k

I just finished up replacing the delivery valve O-rings and crush washers and I put all the fuel lines back on, when I saw a leak at the #1 injector. There were occasional air bubbles coming up at the base of the injector.

I took the car for a spin and 20 minutes later, a bit of smoke was coming out from under the hood from that area.

I made a video of it but I can't upload the video for some reason. I have it as an MWV file and even at 2 seconds, its 416kb size way exceeds the paltry 72 kb they allow us to upload. How can I upload a video? Here's one from YouTube that looks fairly similar; you see a leak at the base of the injector. https://www.youtube.com/shorts/Wlad5JyXEs4

But it looks like maybe an injector gasket or something needs to be replaced. What part number and/or how hard is it to do this? Seems like it'd be pretty straightfoward.

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