If you're referring to the envelope, it's found on a separate plasmid so you can use anything you want/have. We usually just use a CMV driven VSV-G in pcDNA. Addgene does a pretty good job of outlining it:

https://www.addgene.org/guides/lentivirus/?gclid=CjwKCAiA1aiMBhAUEiwACw25McGU5nnAJ_H8DXAyxtxXkNVFlydn9SVti485BoaEgVinnY6zsMGRvxoCxqIQAvD_BwE

Thx for your answer Andrew! I reached Addgene and Penn Vector Core. Addgene does not seem to supply custom preps at the moment and Penn Vector Core is not supplying lentiviruses due to high demand for AAV. Is there any other place we could custom-order lentiviral preps from?

Hi Nahad

Please update if you find any place for custom order lentiviral preparation.

Thanks